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-# once
-
-Only call a function once.
-
-## usage
-
-```javascript
-var once = require('once')
-
-function load (file, cb) {
-  cb = once(cb)
-  loader.load('file')
-  loader.once('load', cb)
-  loader.once('error', cb)
-}
-```
-
-Or add to the Function.prototype in a responsible way:
-
-```javascript
-// only has to be done once
-require('once').proto()
-
-function load (file, cb) {
-  cb = cb.once()
-  loader.load('file')
-  loader.once('load', cb)
-  loader.once('error', cb)
-}
-```
-
-Ironically, the prototype feature makes this module twice as
-complicated as necessary.
-
-To check whether you function has been called, use `fn.called`. Once the
-function is called for the first time the return value of the original
-function is saved in `fn.value` and subsequent calls will continue to
-return this value.
-
-```javascript
-var once = require('once')
-
-function load (cb) {
-  cb = once(cb)
-  var stream = createStream()
-  stream.once('data', cb)
-  stream.once('end', function () {
-    if (!cb.called) cb(new Error('not found'))
-  })
-}
-```
-
-## `once.strict(func)`
-
-Throw an error if the function is called twice.
-
-Some functions are expected to be called only once. Using `once` for them would
-potentially hide logical errors.
-
-In the example below, the `greet` function has to call the callback only once:
-
-```javascript
-function greet (name, cb) {
-  // return is missing from the if statement
-  // when no name is passed, the callback is called twice
-  if (!name) cb('Hello anonymous')
-  cb('Hello ' + name)
-}
-
-function log (msg) {
-  console.log(msg)
-}
-
-// this will print 'Hello anonymous' but the logical error will be missed
-greet(null, once(msg))
-
-// once.strict will print 'Hello anonymous' and throw an error when the callback will be called the second time
-greet(null, once.strict(msg))
-```