Squeak answers false to:

  $a shallowCopy == $a

and is causing me some porting pain right now. 
shallowCopy was overridden for the other atomics;
SmallIntegers, Booleans, the UndefinedObject and
Symbols, but not Characters.

Also, other Smalltalks override it for Behavior as
well, which probably makes sense for the 99.9% case,
and would also make my life happier right now.

Harvesters, are these changes appropriate for Squeak?


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