Decorate constructor functions, and have them return a callable object that delegates to a `callable()` method when invoked.

callable.coffee

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### Moved to https://github.com/shesek/callable-klass
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"use strict"
# without strict mode, `this` defaults to window, so `(this?obj)`
# would always return window.

callable = (ctor) ->
  callable_ctor = (a...) ->
    obj = -> obj.callable.apply (this ? obj), arguments
    obj.__proto__ = ctor::
    result = ctor.call obj
    if typeof result is 'object' then result
    else obj
  callable_ctor.__proto__ = ctor
  callable_ctor:: = ctor::
  # Copy call() and apply() from Function.prototype to the constructor prototype
  {call: callable_ctor::call, apply: callable_ctor::apply} = Function::
  callable_ctor

module.exports = callable