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Chapter 13. Classes, Objects, and Ties > Determining Subclass Membership
Recipe 13.9. Determining Subclass Membership
13.9.1. Problem
You want to know whether an object is an instance of a particular class or that class's subclasses. Perhaps you want to decide whether a particular method should be invoked on an arbitrary object.
13.9.2. Solution
Use methods from the special UNIVERSAL class:
