from preamble:

"Change Set:		CollectionIsZero-dgd
Date:			4 April 2004
Author:			Diego Gomez Deck <DiegoGomezDeck at ConsultAr.com>

Collection>>isZero completes the protocol in collection that make
collections polymorphic with numbers.

This also fix an error raised when Scamper is being installed in 3.7beta
"!
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