Apply changes from https://github.com/mono/mono/pull/14822 to API snapshot

12 files changed, 178 insertions, 93 deletions

diff --git a/profiles/monodroid/Facades/netstandard.cs b/profiles/monodroid/Facades/netstandard.cs
index 80eefec..f435448 100644
--- a/profiles/monodroid/Facades/netstandard.cs
+++ b/profiles/monodroid/Facades/netstandard.cs
@@ -1522,6 +1522,7 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.DisablePrivateReflectionAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.DiscardableAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.DynamicAttribute))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.EnumeratorCancellationAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.ExtensionAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.FixedAddressValueTypeAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.FixedBufferAttribute))]
@@ -1891,6 +1892,8 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.OidGroup))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PaddingMode))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PasswordDeriveBytes))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PbeEncryptionAlgorithm))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PbeParameters))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PKCS1MaskGenerationMethod))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.RandomNumberGenerator))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.RC2))]
@@ -2104,6 +2107,7 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.Sources.ValueTaskSourceStatus))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.Task))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.Task<>))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskAsyncEnumerableExtensions))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskCanceledException))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskCompletionSource<>))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskContinuationOptions))]
diff --git a/profiles/monodroid/System.Core.cs b/profiles/monodroid/System.Core.cs
index afb4837..d3f38c5 100644
--- a/profiles/monodroid/System.Core.cs
+++ b/profiles/monodroid/System.Core.cs
@@ -2864,10 +2864,13 @@ namespace System.Security.Cryptography
         public virtual byte[] DeriveKeyFromHmac(System.Security.Cryptography.ECDiffieHellmanPublicKey otherPartyPublicKey, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, byte[] hmacKey, byte[] secretPrepend, byte[] secretAppend) { throw null; }
         public virtual byte[] DeriveKeyMaterial(System.Security.Cryptography.ECDiffieHellmanPublicKey otherPartyPublicKey) { throw null; }
         public virtual byte[] DeriveKeyTls(System.Security.Cryptography.ECDiffieHellmanPublicKey otherPartyPublicKey, byte[] prfLabel, byte[] prfSeed) { throw null; }
+        public virtual byte[] ExportECPrivateKey() { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportExplicitParameters(bool includePrivateParameters) { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportParameters(bool includePrivateParameters) { throw null; }
         public virtual void GenerateKey(System.Security.Cryptography.ECCurve curve) { }
+        public virtual void ImportECPrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual void ImportParameters(System.Security.Cryptography.ECParameters parameters) { }
+        public virtual bool TryExportECPrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
     }
     [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, MayLeakOnAbort=true)]
     [System.SerializableAttribute]
@@ -2892,16 +2895,19 @@ namespace System.Security.Cryptography
         public static System.Security.Cryptography.ECDsa Create(System.Security.Cryptography.ECCurve curve) { throw null; }
         public static System.Security.Cryptography.ECDsa Create(System.Security.Cryptography.ECParameters parameters) { throw null; }
         public static new System.Security.Cryptography.ECDsa Create(string algorithm) { throw null; }
+        public virtual byte[] ExportECPrivateKey() { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportExplicitParameters(bool includePrivateParameters) { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportParameters(bool includePrivateParameters) { throw null; }
         public virtual void GenerateKey(System.Security.Cryptography.ECCurve curve) { }
         protected virtual byte[] HashData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         protected virtual byte[] HashData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
+        public virtual void ImportECPrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual void ImportParameters(System.Security.Cryptography.ECParameters parameters) { }
         public virtual byte[] SignData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public virtual byte[] SignData(byte[] data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public virtual byte[] SignData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public abstract byte[] SignHash(byte[] hash);
+        public virtual bool TryExportECPrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
         protected virtual bool TryHashData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, out int bytesWritten) { throw null; }
         public virtual bool TrySignData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, out int bytesWritten) { throw null; }
         public virtual bool TrySignHash(System.ReadOnlySpan<byte> hash, System.Span<byte> destination, out int bytesWritten) { throw null; }
@@ -3103,10 +3109,7 @@ namespace System.Threading.Tasks
 {
     public static partial class TaskExtensions
     {
-        public static System.Runtime.CompilerServices.ConfiguredAsyncDisposable ConfigureAwait(this System.IAsyncDisposable source, bool continueOnCapturedContext) { throw null; }
-        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> ConfigureAwait<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, bool continueOnCapturedContext) { throw null; }
         public static System.Threading.Tasks.Task Unwrap(this System.Threading.Tasks.Task<System.Threading.Tasks.Task> task) { throw null; }
         public static System.Threading.Tasks.Task<TResult> Unwrap<TResult>(this System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> task) { throw null; }
-        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> WithCancellation<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, System.Threading.CancellationToken cancellationToken) { throw null; }
     }
 }
diff --git a/profiles/monodroid/System.cs b/profiles/monodroid/System.cs
index 39bee98..40bcb69 100644
--- a/profiles/monodroid/System.cs
+++ b/profiles/monodroid/System.cs
@@ -1209,7 +1209,7 @@ namespace System.ComponentModel
     }
     public abstract partial class BaseNumberConverter : System.ComponentModel.TypeConverter
     {
-        protected BaseNumberConverter() { }
+        internal BaseNumberConverter() { }
         public override bool CanConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Type sourceType) { throw null; }
         public override bool CanConvertTo(System.ComponentModel.ITypeDescriptorContext context, System.Type destinationType) { throw null; }
         public override object ConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value) { throw null; }
diff --git a/profiles/monodroid/mscorlib.cs b/profiles/monodroid/mscorlib.cs
index 14a8e95..77bbbfa 100644
--- a/profiles/monodroid/mscorlib.cs
+++ b/profiles/monodroid/mscorlib.cs
@@ -3611,7 +3611,6 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public Memory(T[] array, int start, int length) { throw null; }
         public static System.Memory<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public System.Memory<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public System.Span<T> Span { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
         public void CopyTo(System.Memory<T> destination) { }
@@ -3622,10 +3621,8 @@ namespace System
         public static implicit operator System.ReadOnlyMemory<T> (System.Memory<T> memory) { throw null; }
         public static implicit operator System.Memory<T> (T[] array) { throw null; }
         public System.Buffers.MemoryHandle Pin() { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(System.Range range) { throw null; }
         public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Memory<T> destination) { throw null; }
@@ -3998,7 +3995,6 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public ReadOnlyMemory(T[] array, int start, int length) { throw null; }
         public static System.ReadOnlyMemory<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public System.ReadOnlyMemory<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public System.ReadOnlySpan<T> Span { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
         public void CopyTo(System.Memory<T> destination) { }
@@ -4008,10 +4004,8 @@ namespace System
         public static implicit operator System.ReadOnlyMemory<T> (System.ArraySegment<T> segment) { throw null; }
         public static implicit operator System.ReadOnlyMemory<T> (T[] array) { throw null; }
         public System.Buffers.MemoryHandle Pin() { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(System.Range range) { throw null; }
         public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Memory<T> destination) { throw null; }
@@ -4029,9 +4023,7 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public ReadOnlySpan(T[] array, int start, int length) { throw null; }
         public static System.ReadOnlySpan<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public ref readonly T this[System.Index index] { get { throw null; } }
         public ref readonly T this[int index] { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
-        public System.ReadOnlySpan<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public void CopyTo(System.Span<T> destination) { }
         [System.ObsoleteAttribute("Equals() on ReadOnlySpan will always throw an exception. Use == instead.")]
@@ -4044,10 +4036,8 @@ namespace System
         public static implicit operator System.ReadOnlySpan<T> (System.ArraySegment<T> segment) { throw null; }
         public static implicit operator System.ReadOnlySpan<T> (T[] array) { throw null; }
         public static bool operator !=(System.ReadOnlySpan<T> left, System.ReadOnlySpan<T> right) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(System.Range range) { throw null; }
         public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Span<T> destination) { throw null; }
@@ -4271,9 +4261,7 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public Span(T[] array, int start, int length) { throw null; }
         public static System.Span<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public ref T this[System.Index index] { get { throw null; } }
         public ref T this[int index] { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
-        public System.Span<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public void Clear() { }
         public void CopyTo(System.Span<T> destination) { }
@@ -4289,10 +4277,8 @@ namespace System
         public static implicit operator System.ReadOnlySpan<T> (System.Span<T> span) { throw null; }
         public static implicit operator System.Span<T> (T[] array) { throw null; }
         public static bool operator !=(System.Span<T> left, System.Span<T> right) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(System.Range range) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Span<T> destination) { throw null; }
@@ -4336,11 +4322,7 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)][System.CLSCompliantAttribute(false)]
         public unsafe String(sbyte* value, int startIndex, int length, System.Text.Encoding enc) { }
         [System.Runtime.CompilerServices.IndexerName("Chars")]
-        public char this[System.Index index] { get { throw null; } }
-        [System.Runtime.CompilerServices.IndexerName("Chars")]
         public char this[int index] { get { throw null; } }
-        [System.Runtime.CompilerServices.IndexerName("Chars")]
-        public string this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public object Clone() { throw null; }
         public static int Compare(System.String strA, int indexA, System.String strB, int indexB, int length) { throw null; }
@@ -4467,10 +4449,8 @@ namespace System
         public bool StartsWith(System.String value) { throw null; }
         public bool StartsWith(System.String value, bool ignoreCase, System.Globalization.CultureInfo culture) { throw null; }
         public bool StartsWith(System.String value, System.StringComparison comparisonType) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.String Substring(System.Index startIndex) { throw null; }
         public System.String Substring(int startIndex) { throw null; }
         public System.String Substring(int startIndex, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.String Substring(System.Range range) { throw null; }
         System.Collections.Generic.IEnumerator<char> System.Collections.Generic.IEnumerable<System.Char>.GetEnumerator() { throw null; }
         System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { throw null; }
         bool System.IConvertible.ToBoolean(System.IFormatProvider provider) { throw null; }
@@ -7133,7 +7113,6 @@ namespace System.Collections.ObjectModel
         bool System.Collections.IList.IsReadOnly { get { throw null; } }
         object System.Collections.IList.this[int index] { get { throw null; } set { } }
         public void Add(T item) { }
-        public void AddRange(System.Collections.Generic.IEnumerable<T> collection) { }
         public void Clear() { }
         protected virtual void ClearItems() { }
         public bool Contains(T item) { throw null; }
@@ -7142,15 +7121,9 @@ namespace System.Collections.ObjectModel
         public int IndexOf(T item) { throw null; }
         public void Insert(int index, T item) { }
         protected virtual void InsertItem(int index, T item) { }
-        protected virtual void InsertItemsRange(int index, System.Collections.Generic.IEnumerable<T> collection) { }
-        public void InsertRange(int index, System.Collections.Generic.IEnumerable<T> collection) { }
         public bool Remove(T item) { throw null; }
         public void RemoveAt(int index) { }
         protected virtual void RemoveItem(int index) { }
-        protected virtual void RemoveItemsRange(int index, int count) { }
-        public void RemoveRange(int index, int count) { }
-        protected virtual void ReplaceItemsRange(int index, int count, System.Collections.Generic.IEnumerable<T> collection) { }
-        public void ReplaceRange(int index, int count, System.Collections.Generic.IEnumerable<T> collection) { }
         protected virtual void SetItem(int index, T item) { }
         void System.Collections.ICollection.CopyTo(System.Array array, int index) { }
         System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { throw null; }
@@ -13796,6 +13769,11 @@ namespace System.Runtime.CompilerServices
     {
         public DiscardableAttribute() { }
     }
+    [System.AttributeUsageAttribute(System.AttributeTargets.Parameter, Inherited=false)]
+    public sealed partial class EnumeratorCancellationAttribute : System.Attribute
+    {
+        public EnumeratorCancellationAttribute() { }
+    }
     [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Method)]
     public sealed partial class ExtensionAttribute : System.Attribute
     {
@@ -21088,8 +21066,20 @@ namespace System.Security.Cryptography
         public static System.Security.Cryptography.AsymmetricAlgorithm Create(string algName) { throw null; }
         public void Dispose() { }
         protected virtual void Dispose(bool disposing) { }
+        public virtual byte[] ExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<byte> passwordBytes, System.Security.Cryptography.PbeParameters pbeParameters) { throw null; }
+        public virtual byte[] ExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<char> password, System.Security.Cryptography.PbeParameters pbeParameters) { throw null; }
+        public virtual byte[] ExportPkcs8PrivateKey() { throw null; }
+        public virtual byte[] ExportSubjectPublicKeyInfo() { throw null; }
         public virtual void FromXmlString(string xmlString) { }
+        public virtual void ImportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<byte> passwordBytes, System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<char> password, System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportPkcs8PrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportSubjectPublicKeyInfo(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual string ToXmlString(bool includePrivateParameters) { throw null; }
+        public virtual bool TryExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<byte> passwordBytes, System.Security.Cryptography.PbeParameters pbeParameters, System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<char> password, System.Security.Cryptography.PbeParameters pbeParameters, System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportPkcs8PrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportSubjectPublicKeyInfo(System.Span<byte> destination, out int bytesWritten) { throw null; }
     }
     [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     public abstract partial class AsymmetricKeyExchangeDeformatter
@@ -21638,6 +21628,21 @@ namespace System.Security.Cryptography
         public override byte[] GetBytes(int cb) { throw null; }
         public override void Reset() { }
     }
+    public enum PbeEncryptionAlgorithm
+    {
+        Aes128Cbc = 1,
+        Aes192Cbc = 2,
+        Aes256Cbc = 3,
+        TripleDes3KeyPkcs12 = 4,
+        Unknown = 0,
+    }
+    public sealed partial class PbeParameters
+    {
+        public PbeParameters(System.Security.Cryptography.PbeEncryptionAlgorithm encryptionAlgorithm, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, int iterationCount) { }
+        public System.Security.Cryptography.PbeEncryptionAlgorithm EncryptionAlgorithm { get { throw null; } }
+        public System.Security.Cryptography.HashAlgorithmName HashAlgorithm { get { throw null; } }
+        public int IterationCount { get { throw null; } }
+    }
     [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     public partial class PKCS1MaskGenerationMethod : System.Security.Cryptography.MaskGenerationMethod
     {
@@ -21657,6 +21662,8 @@ namespace System.Security.Cryptography
         public abstract void GetBytes(byte[] data);
         public virtual void GetBytes(byte[] data, int offset, int count) { }
         public virtual void GetBytes(System.Span<byte> data) { }
+        public static int GetInt32(int toExclusive) { throw null; }
+        public static int GetInt32(int fromInclusive, int toExclusive) { throw null; }
         public virtual void GetNonZeroBytes(byte[] data) { }
         public virtual void GetNonZeroBytes(System.Span<byte> data) { }
     }
@@ -21777,10 +21784,14 @@ namespace System.Security.Cryptography
         public virtual byte[] Encrypt(byte[] data, System.Security.Cryptography.RSAEncryptionPadding padding) { throw null; }
         public virtual byte[] EncryptValue(byte[] rgb) { throw null; }
         public abstract System.Security.Cryptography.RSAParameters ExportParameters(bool includePrivateParameters);
+        public virtual byte[] ExportRSAPrivateKey() { throw null; }
+        public virtual byte[] ExportRSAPublicKey() { throw null; }
         public override void FromXmlString(string xmlString) { }
         protected virtual byte[] HashData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         protected virtual byte[] HashData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public abstract void ImportParameters(System.Security.Cryptography.RSAParameters parameters);
+        public virtual void ImportRSAPrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportRSAPublicKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual byte[] SignData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding) { throw null; }
         public byte[] SignData(byte[] data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding) { throw null; }
         public virtual byte[] SignData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding) { throw null; }
@@ -21788,6 +21799,8 @@ namespace System.Security.Cryptography
         public override string ToXmlString(bool includePrivateParameters) { throw null; }
         public virtual bool TryDecrypt(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.RSAEncryptionPadding padding, out int bytesWritten) { throw null; }
         public virtual bool TryEncrypt(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.RSAEncryptionPadding padding, out int bytesWritten) { throw null; }
+        public virtual bool TryExportRSAPrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportRSAPublicKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
         protected virtual bool TryHashData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, out int bytesWritten) { throw null; }
         public virtual bool TrySignData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding, out int bytesWritten) { throw null; }
         public virtual bool TrySignHash(System.ReadOnlySpan<byte> hash, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding, out int bytesWritten) { throw null; }
@@ -25605,6 +25618,12 @@ namespace System.Threading.Tasks
         public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(params System.Threading.Tasks.Task<TResult>[] tasks) { throw null; }
         public static System.Runtime.CompilerServices.YieldAwaitable Yield() { throw null; }
     }
+    public static partial class TaskAsyncEnumerableExtensions
+    {
+        public static System.Runtime.CompilerServices.ConfiguredAsyncDisposable ConfigureAwait(this System.IAsyncDisposable source, bool continueOnCapturedContext) { throw null; }
+        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> ConfigureAwait<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, bool continueOnCapturedContext) { throw null; }
+        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> WithCancellation<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, System.Threading.CancellationToken cancellationToken) { throw null; }
+    }
     [System.SerializableAttribute]
     public partial class TaskCanceledException : System.OperationCanceledException
     {
diff --git a/profiles/monotouch/Facades/netstandard.cs b/profiles/monotouch/Facades/netstandard.cs
index 80eefec..f435448 100644
--- a/profiles/monotouch/Facades/netstandard.cs
+++ b/profiles/monotouch/Facades/netstandard.cs
@@ -1522,6 +1522,7 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.DisablePrivateReflectionAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.DiscardableAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.DynamicAttribute))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.EnumeratorCancellationAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.ExtensionAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.FixedAddressValueTypeAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.FixedBufferAttribute))]
@@ -1891,6 +1892,8 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.OidGroup))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PaddingMode))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PasswordDeriveBytes))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PbeEncryptionAlgorithm))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PbeParameters))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PKCS1MaskGenerationMethod))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.RandomNumberGenerator))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.RC2))]
@@ -2104,6 +2107,7 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.Sources.ValueTaskSourceStatus))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.Task))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.Task<>))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskAsyncEnumerableExtensions))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskCanceledException))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskCompletionSource<>))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskContinuationOptions))]
diff --git a/profiles/monotouch/System.Core.cs b/profiles/monotouch/System.Core.cs
index cd9660a..a2903c6 100644
--- a/profiles/monotouch/System.Core.cs
+++ b/profiles/monotouch/System.Core.cs
@@ -2837,10 +2837,13 @@ namespace System.Security.Cryptography
         public virtual byte[] DeriveKeyFromHmac(System.Security.Cryptography.ECDiffieHellmanPublicKey otherPartyPublicKey, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, byte[] hmacKey, byte[] secretPrepend, byte[] secretAppend) { throw null; }
         public virtual byte[] DeriveKeyMaterial(System.Security.Cryptography.ECDiffieHellmanPublicKey otherPartyPublicKey) { throw null; }
         public virtual byte[] DeriveKeyTls(System.Security.Cryptography.ECDiffieHellmanPublicKey otherPartyPublicKey, byte[] prfLabel, byte[] prfSeed) { throw null; }
+        public virtual byte[] ExportECPrivateKey() { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportExplicitParameters(bool includePrivateParameters) { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportParameters(bool includePrivateParameters) { throw null; }
         public virtual void GenerateKey(System.Security.Cryptography.ECCurve curve) { }
+        public virtual void ImportECPrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual void ImportParameters(System.Security.Cryptography.ECParameters parameters) { }
+        public virtual bool TryExportECPrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
     }
     [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, MayLeakOnAbort=true)]
     [System.SerializableAttribute]
@@ -2865,16 +2868,19 @@ namespace System.Security.Cryptography
         public static System.Security.Cryptography.ECDsa Create(System.Security.Cryptography.ECCurve curve) { throw null; }
         public static System.Security.Cryptography.ECDsa Create(System.Security.Cryptography.ECParameters parameters) { throw null; }
         public static new System.Security.Cryptography.ECDsa Create(string algorithm) { throw null; }
+        public virtual byte[] ExportECPrivateKey() { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportExplicitParameters(bool includePrivateParameters) { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportParameters(bool includePrivateParameters) { throw null; }
         public virtual void GenerateKey(System.Security.Cryptography.ECCurve curve) { }
         protected virtual byte[] HashData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         protected virtual byte[] HashData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
+        public virtual void ImportECPrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual void ImportParameters(System.Security.Cryptography.ECParameters parameters) { }
         public virtual byte[] SignData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public virtual byte[] SignData(byte[] data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public virtual byte[] SignData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public abstract byte[] SignHash(byte[] hash);
+        public virtual bool TryExportECPrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
         protected virtual bool TryHashData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, out int bytesWritten) { throw null; }
         public virtual bool TrySignData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, out int bytesWritten) { throw null; }
         public virtual bool TrySignHash(System.ReadOnlySpan<byte> hash, System.Span<byte> destination, out int bytesWritten) { throw null; }
@@ -3076,10 +3082,7 @@ namespace System.Threading.Tasks
 {
     public static partial class TaskExtensions
     {
-        public static System.Runtime.CompilerServices.ConfiguredAsyncDisposable ConfigureAwait(this System.IAsyncDisposable source, bool continueOnCapturedContext) { throw null; }
-        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> ConfigureAwait<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, bool continueOnCapturedContext) { throw null; }
         public static System.Threading.Tasks.Task Unwrap(this System.Threading.Tasks.Task<System.Threading.Tasks.Task> task) { throw null; }
         public static System.Threading.Tasks.Task<TResult> Unwrap<TResult>(this System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> task) { throw null; }
-        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> WithCancellation<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, System.Threading.CancellationToken cancellationToken) { throw null; }
     }
 }
diff --git a/profiles/monotouch/System.cs b/profiles/monotouch/System.cs
index 1cc25cb..3ac2ec8 100644
--- a/profiles/monotouch/System.cs
+++ b/profiles/monotouch/System.cs
@@ -1212,7 +1212,7 @@ namespace System.ComponentModel
     }
     public abstract partial class BaseNumberConverter : System.ComponentModel.TypeConverter
     {
-        protected BaseNumberConverter() { }
+        internal BaseNumberConverter() { }
         public override bool CanConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Type sourceType) { throw null; }
         public override bool CanConvertTo(System.ComponentModel.ITypeDescriptorContext context, System.Type destinationType) { throw null; }
         public override object ConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value) { throw null; }
diff --git a/profiles/monotouch/mscorlib.cs b/profiles/monotouch/mscorlib.cs
index 1d23995..7fd1932 100644
--- a/profiles/monotouch/mscorlib.cs
+++ b/profiles/monotouch/mscorlib.cs
@@ -3612,7 +3612,6 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public Memory(T[] array, int start, int length) { throw null; }
         public static System.Memory<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public System.Memory<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public System.Span<T> Span { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
         public void CopyTo(System.Memory<T> destination) { }
@@ -3623,10 +3622,8 @@ namespace System
         public static implicit operator System.ReadOnlyMemory<T> (System.Memory<T> memory) { throw null; }
         public static implicit operator System.Memory<T> (T[] array) { throw null; }
         public System.Buffers.MemoryHandle Pin() { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(System.Range range) { throw null; }
         public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Memory<T> destination) { throw null; }
@@ -3999,7 +3996,6 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public ReadOnlyMemory(T[] array, int start, int length) { throw null; }
         public static System.ReadOnlyMemory<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public System.ReadOnlyMemory<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public System.ReadOnlySpan<T> Span { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
         public void CopyTo(System.Memory<T> destination) { }
@@ -4009,10 +4005,8 @@ namespace System
         public static implicit operator System.ReadOnlyMemory<T> (System.ArraySegment<T> segment) { throw null; }
         public static implicit operator System.ReadOnlyMemory<T> (T[] array) { throw null; }
         public System.Buffers.MemoryHandle Pin() { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(System.Range range) { throw null; }
         public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Memory<T> destination) { throw null; }
@@ -4030,9 +4024,7 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public ReadOnlySpan(T[] array, int start, int length) { throw null; }
         public static System.ReadOnlySpan<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public ref readonly T this[System.Index index] { get { throw null; } }
         public ref readonly T this[int index] { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
-        public System.ReadOnlySpan<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public void CopyTo(System.Span<T> destination) { }
         [System.ObsoleteAttribute("Equals() on ReadOnlySpan will always throw an exception. Use == instead.")]
@@ -4045,10 +4037,8 @@ namespace System
         public static implicit operator System.ReadOnlySpan<T> (System.ArraySegment<T> segment) { throw null; }
         public static implicit operator System.ReadOnlySpan<T> (T[] array) { throw null; }
         public static bool operator !=(System.ReadOnlySpan<T> left, System.ReadOnlySpan<T> right) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(System.Range range) { throw null; }
         public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Span<T> destination) { throw null; }
@@ -4272,9 +4262,7 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public Span(T[] array, int start, int length) { throw null; }
         public static System.Span<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public ref T this[System.Index index] { get { throw null; } }
         public ref T this[int index] { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
-        public System.Span<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public void Clear() { }
         public void CopyTo(System.Span<T> destination) { }
@@ -4290,10 +4278,8 @@ namespace System
         public static implicit operator System.ReadOnlySpan<T> (System.Span<T> span) { throw null; }
         public static implicit operator System.Span<T> (T[] array) { throw null; }
         public static bool operator !=(System.Span<T> left, System.Span<T> right) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(System.Range range) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Span<T> destination) { throw null; }
@@ -4337,11 +4323,7 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)][System.CLSCompliantAttribute(false)]
         public unsafe String(sbyte* value, int startIndex, int length, System.Text.Encoding enc) { }
         [System.Runtime.CompilerServices.IndexerName("Chars")]
-        public char this[System.Index index] { get { throw null; } }
-        [System.Runtime.CompilerServices.IndexerName("Chars")]
         public char this[int index] { get { throw null; } }
-        [System.Runtime.CompilerServices.IndexerName("Chars")]
-        public string this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public object Clone() { throw null; }
         public static int Compare(System.String strA, int indexA, System.String strB, int indexB, int length) { throw null; }
@@ -4468,10 +4450,8 @@ namespace System
         public bool StartsWith(System.String value) { throw null; }
         public bool StartsWith(System.String value, bool ignoreCase, System.Globalization.CultureInfo culture) { throw null; }
         public bool StartsWith(System.String value, System.StringComparison comparisonType) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.String Substring(System.Index startIndex) { throw null; }
         public System.String Substring(int startIndex) { throw null; }
         public System.String Substring(int startIndex, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.String Substring(System.Range range) { throw null; }
         System.Collections.Generic.IEnumerator<char> System.Collections.Generic.IEnumerable<System.Char>.GetEnumerator() { throw null; }
         System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { throw null; }
         bool System.IConvertible.ToBoolean(System.IFormatProvider provider) { throw null; }
@@ -7134,7 +7114,6 @@ namespace System.Collections.ObjectModel
         bool System.Collections.IList.IsReadOnly { get { throw null; } }
         object System.Collections.IList.this[int index] { get { throw null; } set { } }
         public void Add(T item) { }
-        public void AddRange(System.Collections.Generic.IEnumerable<T> collection) { }
         public void Clear() { }
         protected virtual void ClearItems() { }
         public bool Contains(T item) { throw null; }
@@ -7143,15 +7122,9 @@ namespace System.Collections.ObjectModel
         public int IndexOf(T item) { throw null; }
         public void Insert(int index, T item) { }
         protected virtual void InsertItem(int index, T item) { }
-        protected virtual void InsertItemsRange(int index, System.Collections.Generic.IEnumerable<T> collection) { }
-        public void InsertRange(int index, System.Collections.Generic.IEnumerable<T> collection) { }
         public bool Remove(T item) { throw null; }
         public void RemoveAt(int index) { }
         protected virtual void RemoveItem(int index) { }
-        protected virtual void RemoveItemsRange(int index, int count) { }
-        public void RemoveRange(int index, int count) { }
-        protected virtual void ReplaceItemsRange(int index, int count, System.Collections.Generic.IEnumerable<T> collection) { }
-        public void ReplaceRange(int index, int count, System.Collections.Generic.IEnumerable<T> collection) { }
         protected virtual void SetItem(int index, T item) { }
         void System.Collections.ICollection.CopyTo(System.Array array, int index) { }
         System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { throw null; }
@@ -13680,6 +13653,11 @@ namespace System.Runtime.CompilerServices
     {
         public DiscardableAttribute() { }
     }
+    [System.AttributeUsageAttribute(System.AttributeTargets.Parameter, Inherited=false)]
+    public sealed partial class EnumeratorCancellationAttribute : System.Attribute
+    {
+        public EnumeratorCancellationAttribute() { }
+    }
     [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Method)]
     public sealed partial class ExtensionAttribute : System.Attribute
     {
@@ -14878,9 +14856,12 @@ namespace System.Runtime.InteropServices
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)]public static void FreeCoTaskMem(System.IntPtr ptr) { }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)][System.Runtime.ConstrainedExecution.ReliabilityContractAttribute(System.Runtime.ConstrainedExecution.Consistency.WillNotCorruptState, System.Runtime.ConstrainedExecution.Cer.Success)]
         public static void FreeHGlobal(System.IntPtr hglobal) { }
+        public static System.Guid GenerateGuidForType(System.Type type) { throw null; }
+        public static string GenerateProgIdForType(System.Type type) { throw null; }
         public static System.IntPtr GetComInterfaceForObject(object o, System.Type T) { throw null; }
         public static System.IntPtr GetComInterfaceForObject(object o, System.Type T, System.Runtime.InteropServices.CustomQueryInterfaceMode mode) { throw null; }
         public static System.IntPtr GetComInterfaceForObject<T, TInterface>(T o) { throw null; }
+        public static object GetComObjectData(object obj, object key) { throw null; }
         public static System.Delegate GetDelegateForFunctionPointer(System.IntPtr ptr, System.Type t) { throw null; }
         public static TDelegate GetDelegateForFunctionPointer<TDelegate>(System.IntPtr ptr) { throw null; }
         public static int GetExceptionCode() { throw null; }
@@ -14888,9 +14869,11 @@ namespace System.Runtime.InteropServices
         public static System.Exception GetExceptionForHR(int errorCode, System.IntPtr errorInfo) { throw null; }
         public static System.IntPtr GetFunctionPointerForDelegate(System.Delegate d) { throw null; }
         public static System.IntPtr GetFunctionPointerForDelegate<TDelegate>(TDelegate d) { throw null; }
+        public static System.IntPtr GetHINSTANCE(System.Reflection.Module m) { throw null; }
         public static int GetHRForException(System.Exception e) { throw null; }
         [System.Runtime.ConstrainedExecution.ReliabilityContractAttribute(System.Runtime.ConstrainedExecution.Consistency.WillNotCorruptState, System.Runtime.ConstrainedExecution.Cer.Success)]
         public static int GetHRForLastWin32Error() { throw null; }
+        public static System.IntPtr GetIDispatchForObject(object o) { throw null; }
         public static System.IntPtr GetIUnknownForObject(object o) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)][System.Runtime.ConstrainedExecution.ReliabilityContractAttribute(System.Runtime.ConstrainedExecution.Consistency.WillNotCorruptState, System.Runtime.ConstrainedExecution.Cer.Success)]
         public static int GetLastWin32Error() { throw null; }
@@ -14902,6 +14885,7 @@ namespace System.Runtime.InteropServices
         public static object[] GetObjectsForNativeVariants(System.IntPtr aSrcNativeVariant, int cVars) { throw null; }
         public static T[] GetObjectsForNativeVariants<T>(System.IntPtr aSrcNativeVariant, int cVars) { throw null; }
         public static int GetStartComSlot(System.Type t) { throw null; }
+        public static object GetTypedObjectForIUnknown(System.IntPtr pUnk, System.Type t) { throw null; }
         public static System.Type GetTypeFromCLSID(System.Guid clsid) { throw null; }
         public static string GetTypeInfoName(System.Runtime.InteropServices.ComTypes.ITypeInfo typeInfo) { throw null; }
         public static object GetUniqueObjectForIUnknown(System.IntPtr unknown) { throw null; }
@@ -14963,6 +14947,7 @@ namespace System.Runtime.InteropServices
         public static System.IntPtr SecureStringToCoTaskMemUnicode(System.Security.SecureString s) { throw null; }
         public static System.IntPtr SecureStringToGlobalAllocAnsi(System.Security.SecureString s) { throw null; }
         public static System.IntPtr SecureStringToGlobalAllocUnicode(System.Security.SecureString s) { throw null; }
+        public static bool SetComObjectData(object obj, object key, object data) { throw null; }
         [System.Runtime.InteropServices.ComVisibleAttribute(true)]
         public static int SizeOf(object structure) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)]public static int SizeOf(System.Type t) { throw null; }
@@ -20471,8 +20456,20 @@ namespace System.Security.Cryptography
         public static System.Security.Cryptography.AsymmetricAlgorithm Create(string algName) { throw null; }
         public void Dispose() { }
         protected virtual void Dispose(bool disposing) { }
+        public virtual byte[] ExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<byte> passwordBytes, System.Security.Cryptography.PbeParameters pbeParameters) { throw null; }
+        public virtual byte[] ExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<char> password, System.Security.Cryptography.PbeParameters pbeParameters) { throw null; }
+        public virtual byte[] ExportPkcs8PrivateKey() { throw null; }
+        public virtual byte[] ExportSubjectPublicKeyInfo() { throw null; }
         public virtual void FromXmlString(string xmlString) { }
+        public virtual void ImportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<byte> passwordBytes, System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<char> password, System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportPkcs8PrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportSubjectPublicKeyInfo(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual string ToXmlString(bool includePrivateParameters) { throw null; }
+        public virtual bool TryExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<byte> passwordBytes, System.Security.Cryptography.PbeParameters pbeParameters, System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<char> password, System.Security.Cryptography.PbeParameters pbeParameters, System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportPkcs8PrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportSubjectPublicKeyInfo(System.Span<byte> destination, out int bytesWritten) { throw null; }
     }
     [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     public abstract partial class AsymmetricKeyExchangeDeformatter
@@ -21016,6 +21013,21 @@ namespace System.Security.Cryptography
         public override byte[] GetBytes(int cb) { throw null; }
         public override void Reset() { }
     }
+    public enum PbeEncryptionAlgorithm
+    {
+        Aes128Cbc = 1,
+        Aes192Cbc = 2,
+        Aes256Cbc = 3,
+        TripleDes3KeyPkcs12 = 4,
+        Unknown = 0,
+    }
+    public sealed partial class PbeParameters
+    {
+        public PbeParameters(System.Security.Cryptography.PbeEncryptionAlgorithm encryptionAlgorithm, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, int iterationCount) { }
+        public System.Security.Cryptography.PbeEncryptionAlgorithm EncryptionAlgorithm { get { throw null; } }
+        public System.Security.Cryptography.HashAlgorithmName HashAlgorithm { get { throw null; } }
+        public int IterationCount { get { throw null; } }
+    }
     [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     public partial class PKCS1MaskGenerationMethod : System.Security.Cryptography.MaskGenerationMethod
     {
@@ -21035,6 +21047,8 @@ namespace System.Security.Cryptography
         public abstract void GetBytes(byte[] data);
         public virtual void GetBytes(byte[] data, int offset, int count) { }
         public virtual void GetBytes(System.Span<byte> data) { }
+        public static int GetInt32(int toExclusive) { throw null; }
+        public static int GetInt32(int fromInclusive, int toExclusive) { throw null; }
         public virtual void GetNonZeroBytes(byte[] data) { }
         public virtual void GetNonZeroBytes(System.Span<byte> data) { }
     }
@@ -21148,10 +21162,14 @@ namespace System.Security.Cryptography
         public virtual byte[] Encrypt(byte[] data, System.Security.Cryptography.RSAEncryptionPadding padding) { throw null; }
         public virtual byte[] EncryptValue(byte[] rgb) { throw null; }
         public abstract System.Security.Cryptography.RSAParameters ExportParameters(bool includePrivateParameters);
+        public virtual byte[] ExportRSAPrivateKey() { throw null; }
+        public virtual byte[] ExportRSAPublicKey() { throw null; }
         public override void FromXmlString(string xmlString) { }
         protected virtual byte[] HashData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         protected virtual byte[] HashData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public abstract void ImportParameters(System.Security.Cryptography.RSAParameters parameters);
+        public virtual void ImportRSAPrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportRSAPublicKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual byte[] SignData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding) { throw null; }
         public byte[] SignData(byte[] data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding) { throw null; }
         public virtual byte[] SignData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding) { throw null; }
@@ -21159,6 +21177,8 @@ namespace System.Security.Cryptography
         public override string ToXmlString(bool includePrivateParameters) { throw null; }
         public virtual bool TryDecrypt(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.RSAEncryptionPadding padding, out int bytesWritten) { throw null; }
         public virtual bool TryEncrypt(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.RSAEncryptionPadding padding, out int bytesWritten) { throw null; }
+        public virtual bool TryExportRSAPrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportRSAPublicKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
         protected virtual bool TryHashData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, out int bytesWritten) { throw null; }
         public virtual bool TrySignData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding, out int bytesWritten) { throw null; }
         public virtual bool TrySignHash(System.ReadOnlySpan<byte> hash, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding, out int bytesWritten) { throw null; }
@@ -24966,6 +24986,12 @@ namespace System.Threading.Tasks
         public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(params System.Threading.Tasks.Task<TResult>[] tasks) { throw null; }
         public static System.Runtime.CompilerServices.YieldAwaitable Yield() { throw null; }
     }
+    public static partial class TaskAsyncEnumerableExtensions
+    {
+        public static System.Runtime.CompilerServices.ConfiguredAsyncDisposable ConfigureAwait(this System.IAsyncDisposable source, bool continueOnCapturedContext) { throw null; }
+        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> ConfigureAwait<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, bool continueOnCapturedContext) { throw null; }
+        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> WithCancellation<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, System.Threading.CancellationToken cancellationToken) { throw null; }
+    }
     [System.SerializableAttribute]
     public partial class TaskCanceledException : System.OperationCanceledException
     {
diff --git a/profiles/net_4_x/Facades/netstandard.cs b/profiles/net_4_x/Facades/netstandard.cs
index 80eefec..f435448 100644
--- a/profiles/net_4_x/Facades/netstandard.cs
+++ b/profiles/net_4_x/Facades/netstandard.cs
@@ -1522,6 +1522,7 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.DisablePrivateReflectionAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.DiscardableAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.DynamicAttribute))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.EnumeratorCancellationAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.ExtensionAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.FixedAddressValueTypeAttribute))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Runtime.CompilerServices.FixedBufferAttribute))]
@@ -1891,6 +1892,8 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.OidGroup))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PaddingMode))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PasswordDeriveBytes))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PbeEncryptionAlgorithm))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PbeParameters))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.PKCS1MaskGenerationMethod))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.RandomNumberGenerator))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Security.Cryptography.RC2))]
@@ -2104,6 +2107,7 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.Sources.ValueTaskSourceStatus))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.Task))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.Task<>))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskAsyncEnumerableExtensions))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskCanceledException))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskCompletionSource<>))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedToAttribute(typeof(System.Threading.Tasks.TaskContinuationOptions))]
diff --git a/profiles/net_4_x/System.Core.cs b/profiles/net_4_x/System.Core.cs
index 083d380..184ec5a 100644
--- a/profiles/net_4_x/System.Core.cs
+++ b/profiles/net_4_x/System.Core.cs
@@ -2868,10 +2868,13 @@ namespace System.Security.Cryptography
         public virtual byte[] DeriveKeyFromHmac(System.Security.Cryptography.ECDiffieHellmanPublicKey otherPartyPublicKey, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, byte[] hmacKey, byte[] secretPrepend, byte[] secretAppend) { throw null; }
         public virtual byte[] DeriveKeyMaterial(System.Security.Cryptography.ECDiffieHellmanPublicKey otherPartyPublicKey) { throw null; }
         public virtual byte[] DeriveKeyTls(System.Security.Cryptography.ECDiffieHellmanPublicKey otherPartyPublicKey, byte[] prfLabel, byte[] prfSeed) { throw null; }
+        public virtual byte[] ExportECPrivateKey() { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportExplicitParameters(bool includePrivateParameters) { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportParameters(bool includePrivateParameters) { throw null; }
         public virtual void GenerateKey(System.Security.Cryptography.ECCurve curve) { }
+        public virtual void ImportECPrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual void ImportParameters(System.Security.Cryptography.ECParameters parameters) { }
+        public virtual bool TryExportECPrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
     }
     [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, MayLeakOnAbort=true)]
     [System.SerializableAttribute]
@@ -2896,16 +2899,19 @@ namespace System.Security.Cryptography
         public static System.Security.Cryptography.ECDsa Create(System.Security.Cryptography.ECCurve curve) { throw null; }
         public static System.Security.Cryptography.ECDsa Create(System.Security.Cryptography.ECParameters parameters) { throw null; }
         public static new System.Security.Cryptography.ECDsa Create(string algorithm) { throw null; }
+        public virtual byte[] ExportECPrivateKey() { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportExplicitParameters(bool includePrivateParameters) { throw null; }
         public virtual System.Security.Cryptography.ECParameters ExportParameters(bool includePrivateParameters) { throw null; }
         public virtual void GenerateKey(System.Security.Cryptography.ECCurve curve) { }
         protected virtual byte[] HashData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         protected virtual byte[] HashData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
+        public virtual void ImportECPrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual void ImportParameters(System.Security.Cryptography.ECParameters parameters) { }
         public virtual byte[] SignData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public virtual byte[] SignData(byte[] data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public virtual byte[] SignData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public abstract byte[] SignHash(byte[] hash);
+        public virtual bool TryExportECPrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
         protected virtual bool TryHashData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, out int bytesWritten) { throw null; }
         public virtual bool TrySignData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, out int bytesWritten) { throw null; }
         public virtual bool TrySignHash(System.ReadOnlySpan<byte> hash, System.Span<byte> destination, out int bytesWritten) { throw null; }
@@ -3172,10 +3178,7 @@ namespace System.Threading.Tasks
 {
     public static partial class TaskExtensions
     {
-        public static System.Runtime.CompilerServices.ConfiguredAsyncDisposable ConfigureAwait(this System.IAsyncDisposable source, bool continueOnCapturedContext) { throw null; }
-        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> ConfigureAwait<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, bool continueOnCapturedContext) { throw null; }
         public static System.Threading.Tasks.Task Unwrap(this System.Threading.Tasks.Task<System.Threading.Tasks.Task> task) { throw null; }
         public static System.Threading.Tasks.Task<TResult> Unwrap<TResult>(this System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> task) { throw null; }
-        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> WithCancellation<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, System.Threading.CancellationToken cancellationToken) { throw null; }
     }
 }
diff --git a/profiles/net_4_x/System.cs b/profiles/net_4_x/System.cs
index faf5375..851419e 100644
--- a/profiles/net_4_x/System.cs
+++ b/profiles/net_4_x/System.cs
@@ -2666,7 +2666,7 @@ namespace System.ComponentModel
     }
     public abstract partial class BaseNumberConverter : System.ComponentModel.TypeConverter
     {
-        protected BaseNumberConverter() { }
+        internal BaseNumberConverter() { }
         public override bool CanConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Type sourceType) { throw null; }
         public override bool CanConvertTo(System.ComponentModel.ITypeDescriptorContext context, System.Type destinationType) { throw null; }
         public override object ConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value) { throw null; }
diff --git a/profiles/net_4_x/mscorlib.cs b/profiles/net_4_x/mscorlib.cs
index 363cfcb..f25752a 100644
--- a/profiles/net_4_x/mscorlib.cs
+++ b/profiles/net_4_x/mscorlib.cs
@@ -3657,7 +3657,6 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public Memory(T[] array, int start, int length) { throw null; }
         public static System.Memory<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public System.Memory<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public System.Span<T> Span { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
         public void CopyTo(System.Memory<T> destination) { }
@@ -3668,10 +3667,8 @@ namespace System
         public static implicit operator System.ReadOnlyMemory<T> (System.Memory<T> memory) { throw null; }
         public static implicit operator System.Memory<T> (T[] array) { throw null; }
         public System.Buffers.MemoryHandle Pin() { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Memory<T> Slice(System.Range range) { throw null; }
         public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Memory<T> destination) { throw null; }
@@ -4044,7 +4041,6 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public ReadOnlyMemory(T[] array, int start, int length) { throw null; }
         public static System.ReadOnlyMemory<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public System.ReadOnlyMemory<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public System.ReadOnlySpan<T> Span { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
         public void CopyTo(System.Memory<T> destination) { }
@@ -4054,10 +4050,8 @@ namespace System
         public static implicit operator System.ReadOnlyMemory<T> (System.ArraySegment<T> segment) { throw null; }
         public static implicit operator System.ReadOnlyMemory<T> (T[] array) { throw null; }
         public System.Buffers.MemoryHandle Pin() { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlyMemory<T> Slice(System.Range range) { throw null; }
         public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Memory<T> destination) { throw null; }
@@ -4075,9 +4069,7 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public ReadOnlySpan(T[] array, int start, int length) { throw null; }
         public static System.ReadOnlySpan<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public ref readonly T this[System.Index index] { get { throw null; } }
         public ref readonly T this[int index] { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
-        public System.ReadOnlySpan<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public void CopyTo(System.Span<T> destination) { }
         [System.ObsoleteAttribute("Equals() on ReadOnlySpan will always throw an exception. Use == instead.")]
@@ -4090,10 +4082,8 @@ namespace System
         public static implicit operator System.ReadOnlySpan<T> (System.ArraySegment<T> segment) { throw null; }
         public static implicit operator System.ReadOnlySpan<T> (T[] array) { throw null; }
         public static bool operator !=(System.ReadOnlySpan<T> left, System.ReadOnlySpan<T> right) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.ReadOnlySpan<T> Slice(System.Range range) { throw null; }
         public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Span<T> destination) { throw null; }
@@ -4317,9 +4307,7 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public Span(T[] array, int start, int length) { throw null; }
         public static System.Span<T> Empty { get { throw null; } }
         public bool IsEmpty { get { throw null; } }
-        public ref T this[System.Index index] { get { throw null; } }
         public ref T this[int index] { [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]get { throw null; } }
-        public System.Span<T> this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public void Clear() { }
         public void CopyTo(System.Span<T> destination) { }
@@ -4335,10 +4323,8 @@ namespace System
         public static implicit operator System.ReadOnlySpan<T> (System.Span<T> span) { throw null; }
         public static implicit operator System.Span<T> (T[] array) { throw null; }
         public static bool operator !=(System.Span<T> left, System.Span<T> right) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(System.Index startIndex) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(int start) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(int start, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.Span<T> Slice(System.Range range) { throw null; }
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public T[] ToArray() { throw null; }
         public override string ToString() { throw null; }
         public bool TryCopyTo(System.Span<T> destination) { throw null; }
@@ -4382,11 +4368,7 @@ namespace System
         [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.InternalCall)][System.CLSCompliantAttribute(false)]
         public unsafe String(sbyte* value, int startIndex, int length, System.Text.Encoding enc) { }
         [System.Runtime.CompilerServices.IndexerName("Chars")]
-        public char this[System.Index index] { get { throw null; } }
-        [System.Runtime.CompilerServices.IndexerName("Chars")]
         public char this[int index] { get { throw null; } }
-        [System.Runtime.CompilerServices.IndexerName("Chars")]
-        public string this[System.Range range] { get { throw null; } }
         public int Length { get { throw null; } }
         public object Clone() { throw null; }
         public static int Compare(System.String strA, int indexA, System.String strB, int indexB, int length) { throw null; }
@@ -4513,10 +4495,8 @@ namespace System
         public bool StartsWith(System.String value) { throw null; }
         public bool StartsWith(System.String value, bool ignoreCase, System.Globalization.CultureInfo culture) { throw null; }
         public bool StartsWith(System.String value, System.StringComparison comparisonType) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.String Substring(System.Index startIndex) { throw null; }
         public System.String Substring(int startIndex) { throw null; }
         public System.String Substring(int startIndex, int length) { throw null; }
-        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]public System.String Substring(System.Range range) { throw null; }
         System.Collections.Generic.IEnumerator<char> System.Collections.Generic.IEnumerable<System.Char>.GetEnumerator() { throw null; }
         System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { throw null; }
         bool System.IConvertible.ToBoolean(System.IFormatProvider provider) { throw null; }
@@ -7161,7 +7141,6 @@ namespace System.Collections.ObjectModel
         bool System.Collections.IList.IsReadOnly { get { throw null; } }
         object System.Collections.IList.this[int index] { get { throw null; } set { } }
         public void Add(T item) { }
-        public void AddRange(System.Collections.Generic.IEnumerable<T> collection) { }
         public void Clear() { }
         protected virtual void ClearItems() { }
         public bool Contains(T item) { throw null; }
@@ -7170,15 +7149,9 @@ namespace System.Collections.ObjectModel
         public int IndexOf(T item) { throw null; }
         public void Insert(int index, T item) { }
         protected virtual void InsertItem(int index, T item) { }
-        protected virtual void InsertItemsRange(int index, System.Collections.Generic.IEnumerable<T> collection) { }
-        public void InsertRange(int index, System.Collections.Generic.IEnumerable<T> collection) { }
         public bool Remove(T item) { throw null; }
         public void RemoveAt(int index) { }
         protected virtual void RemoveItem(int index) { }
-        protected virtual void RemoveItemsRange(int index, int count) { }
-        public void RemoveRange(int index, int count) { }
-        protected virtual void ReplaceItemsRange(int index, int count, System.Collections.Generic.IEnumerable<T> collection) { }
-        public void ReplaceRange(int index, int count, System.Collections.Generic.IEnumerable<T> collection) { }
         protected virtual void SetItem(int index, T item) { }
         void System.Collections.ICollection.CopyTo(System.Array array, int index) { }
         System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { throw null; }
@@ -13918,6 +13891,11 @@ namespace System.Runtime.CompilerServices
     {
         public DiscardableAttribute() { }
     }
+    [System.AttributeUsageAttribute(System.AttributeTargets.Parameter, Inherited=false)]
+    public sealed partial class EnumeratorCancellationAttribute : System.Attribute
+    {
+        public EnumeratorCancellationAttribute() { }
+    }
     [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Method)]
     public sealed partial class ExtensionAttribute : System.Attribute
     {
@@ -21235,8 +21213,20 @@ namespace System.Security.Cryptography
         public static System.Security.Cryptography.AsymmetricAlgorithm Create(string algName) { throw null; }
         public void Dispose() { }
         protected virtual void Dispose(bool disposing) { }
+        public virtual byte[] ExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<byte> passwordBytes, System.Security.Cryptography.PbeParameters pbeParameters) { throw null; }
+        public virtual byte[] ExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<char> password, System.Security.Cryptography.PbeParameters pbeParameters) { throw null; }
+        public virtual byte[] ExportPkcs8PrivateKey() { throw null; }
+        public virtual byte[] ExportSubjectPublicKeyInfo() { throw null; }
         public virtual void FromXmlString(string xmlString) { }
+        public virtual void ImportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<byte> passwordBytes, System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<char> password, System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportPkcs8PrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportSubjectPublicKeyInfo(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual string ToXmlString(bool includePrivateParameters) { throw null; }
+        public virtual bool TryExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<byte> passwordBytes, System.Security.Cryptography.PbeParameters pbeParameters, System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportEncryptedPkcs8PrivateKey(System.ReadOnlySpan<char> password, System.Security.Cryptography.PbeParameters pbeParameters, System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportPkcs8PrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportSubjectPublicKeyInfo(System.Span<byte> destination, out int bytesWritten) { throw null; }
     }
     [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     public abstract partial class AsymmetricKeyExchangeDeformatter
@@ -21786,6 +21776,21 @@ namespace System.Security.Cryptography
         public override byte[] GetBytes(int cb) { throw null; }
         public override void Reset() { }
     }
+    public enum PbeEncryptionAlgorithm
+    {
+        Aes128Cbc = 1,
+        Aes192Cbc = 2,
+        Aes256Cbc = 3,
+        TripleDes3KeyPkcs12 = 4,
+        Unknown = 0,
+    }
+    public sealed partial class PbeParameters
+    {
+        public PbeParameters(System.Security.Cryptography.PbeEncryptionAlgorithm encryptionAlgorithm, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, int iterationCount) { }
+        public System.Security.Cryptography.PbeEncryptionAlgorithm EncryptionAlgorithm { get { throw null; } }
+        public System.Security.Cryptography.HashAlgorithmName HashAlgorithm { get { throw null; } }
+        public int IterationCount { get { throw null; } }
+    }
     [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     public partial class PKCS1MaskGenerationMethod : System.Security.Cryptography.MaskGenerationMethod
     {
@@ -21805,6 +21810,8 @@ namespace System.Security.Cryptography
         public abstract void GetBytes(byte[] data);
         public virtual void GetBytes(byte[] data, int offset, int count) { }
         public virtual void GetBytes(System.Span<byte> data) { }
+        public static int GetInt32(int toExclusive) { throw null; }
+        public static int GetInt32(int fromInclusive, int toExclusive) { throw null; }
         public virtual void GetNonZeroBytes(byte[] data) { }
         public virtual void GetNonZeroBytes(System.Span<byte> data) { }
     }
@@ -21926,10 +21933,14 @@ namespace System.Security.Cryptography
         public virtual byte[] Encrypt(byte[] data, System.Security.Cryptography.RSAEncryptionPadding padding) { throw null; }
         public virtual byte[] EncryptValue(byte[] rgb) { throw null; }
         public abstract System.Security.Cryptography.RSAParameters ExportParameters(bool includePrivateParameters);
+        public virtual byte[] ExportRSAPrivateKey() { throw null; }
+        public virtual byte[] ExportRSAPublicKey() { throw null; }
         public override void FromXmlString(string xmlString) { }
         protected virtual byte[] HashData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         protected virtual byte[] HashData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm) { throw null; }
         public abstract void ImportParameters(System.Security.Cryptography.RSAParameters parameters);
+        public virtual void ImportRSAPrivateKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
+        public virtual void ImportRSAPublicKey(System.ReadOnlySpan<byte> source, out int bytesRead) { throw null; }
         public virtual byte[] SignData(byte[] data, int offset, int count, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding) { throw null; }
         public byte[] SignData(byte[] data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding) { throw null; }
         public virtual byte[] SignData(System.IO.Stream data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding) { throw null; }
@@ -21937,6 +21948,8 @@ namespace System.Security.Cryptography
         public override string ToXmlString(bool includePrivateParameters) { throw null; }
         public virtual bool TryDecrypt(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.RSAEncryptionPadding padding, out int bytesWritten) { throw null; }
         public virtual bool TryEncrypt(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.RSAEncryptionPadding padding, out int bytesWritten) { throw null; }
+        public virtual bool TryExportRSAPrivateKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
+        public virtual bool TryExportRSAPublicKey(System.Span<byte> destination, out int bytesWritten) { throw null; }
         protected virtual bool TryHashData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, out int bytesWritten) { throw null; }
         public virtual bool TrySignData(System.ReadOnlySpan<byte> data, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding, out int bytesWritten) { throw null; }
         public virtual bool TrySignHash(System.ReadOnlySpan<byte> hash, System.Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding, out int bytesWritten) { throw null; }
@@ -25762,6 +25775,12 @@ namespace System.Threading.Tasks
         public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(params System.Threading.Tasks.Task<TResult>[] tasks) { throw null; }
         public static System.Runtime.CompilerServices.YieldAwaitable Yield() { throw null; }
     }
+    public static partial class TaskAsyncEnumerableExtensions
+    {
+        public static System.Runtime.CompilerServices.ConfiguredAsyncDisposable ConfigureAwait(this System.IAsyncDisposable source, bool continueOnCapturedContext) { throw null; }
+        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> ConfigureAwait<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, bool continueOnCapturedContext) { throw null; }
+        public static System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable<T> WithCancellation<T>(this System.Collections.Generic.IAsyncEnumerable<T> source, System.Threading.CancellationToken cancellationToken) { throw null; }
+    }
     [System.SerializableAttribute]
     public partial class TaskCanceledException : System.OperationCanceledException
     {