[Vaguely] From Fowler's RefactoringImprovingTheDesignOfExistingCode:
	* If you find yourself with a handful of ForeignMethod''''''s, it might be best to derive your own class from the existing one and use it instead.

Some feasible examples include:
	* A Collection class that allows you to UseClosuresNotEnumerations
	* ...
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c.f. MartinFowler's RefactoringImprovingTheDesignOfExistingCode, pg. 149. 
http://www.refactoring.com/catalog/introduceLocalExtension.html