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Adds UnboundMethod#bind_class to bind an UnboundMethod to a class.

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= force_bind

Adds UnboundMethod#force_bind to bind an unbound method to class (or any object of any type).
It basically bypasses the argument type checking that #bind has.

== Requirements

* Ruby 1.9.1 or greater (does not work in Ruby 1.8.x)

== Example

Bind an instance method to its class (making it act like a class method):

  class Foo
    def bar
      puts "I'm inside #{self}"
  #=> "I'm inside #<Foo:0x123456>"
  meth = Foo.instance_method(:bar).force_bind(Foo)
  #=> "I'm inside Foo"
You can also use this to rebind the instance method of any object to any
other object:

  class A
    def foo; self end
  class B; end
  meth = A.instance_method(:foo).force_bind(
  #=> #<B:0x123456>
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