extensible RemoveAllSuchThat:

[Paul Dufresne]

If I add 1 upTo: 100 to a Set.
And then I removeAllSuchThat: [ | :n | n > 50 ].
The result Set have 75 elements.

I don't understand yet the difference between a ShallowCopy and a copy.
But don't you need a plain copy here?

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