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2.2.8 Final Classes
F = FinalClass( string name, Object dfn )Define final named class C identified by name described by dfn.
F = FinalClass( string name ).extend( Object dfn )Define final named class C identified by name described by dfn.
F = FinalClass( Object dfn )Define anonymous final class C as described by dfn.
F = FinalClass.extend( Object dfn )Define anonymous final class C as described by dfn.
Final classes operate exactly as “normal” classes do (see Defining Classes), with the exception that they cannot be inherited from.