from preamble:

"Change Set:		removeAll-raok
Date:			16 August 2002
Author:			Dr Richard A. O'Keefe

Bergel Alexandre discovered that
	t := #(1 2 3 4) asOrderedCollection.
	t removeAll: t.
	t
=> an OrderedCollection(2 4)
which is wrong for the result and wrong for
the collection of things removed.  This is the
simplest change I can think of to make this
case work without slowing other cases down
too much.  If the receiver and the collection
removed are the same object, a COPY of the
collection is used and returned as the result."!
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