KFDecorator
KFDecorator can produce, at runtime, a wrapper object that modifies the behavior of an underlying base object. Methods like -[KFDecorator setBlock:forSelector:] allow the user to provide FScript blocks to execute in response to messages. Messages without a specified FScript block are passed on to the base object. This can also be used to build an object up from scratch as an assemblage of FScript blocks.
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