from preamble:

"Change Set:		AddAllFix-ac
Date:			6 August 2003
Author:			Andrew Catton

Fixed bug where:

someCollection addAll: someCollection

causes an infinite loop.  

- #addAll*: methods now use a copy of the parameter if it is the same as
the receiver.  
- The old behavior was moved to #basicAddAll*: variants.  
- #basicAddAll: is used by SortedCollection>>copy to avoid an
#addAll:->#copy->#addAll: infinite loop when adding a collection to
itself.
- Removed OrderedCollection>>addAll: as it didn't actually change the
semantics inherited from Collection>>addAll: and would have required a
further override on SortedCollection had it remained."!
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