from preamble:

"Change Set:		ProtoObject-isBehavior
Date:			24 July 2001
Author:			rww

added the method #isBehavior to return false.  Subclasses of
ProtoObject, which are inMemory, are manipulated in
SystemDictionary>>obsoleteBehaviors and
ClassBuilder>>fixObsoleteReferencesTo: which can blow up with a DNU (or
nonBooleanReturn for Forwarders)"!
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