from preamble:

"Change Set:		CategorizerFix
Date:			25 February 2005
Author:			Hans-Martin Mosner

Fixes a bug with reading class organizations containing nil, true or
false as message selectors.
The cause of the bug: Recent Squeak versions changed parsing of literal
vectors such that nil, true and false are not stored as Symbols but as
the respective objects."!
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