Christopher Barker writes:

 > I meant in the context of putting things in, or testing whether they are
 > in, sets. Not in any other context.

OK, but restricting context that way is asking for eventual trouble,
because there's one more thing you can do with sets: get stuff out of
them (by iterating).

 > But to see if I understand correctly, you couldn’t quite use a set to
 > intern objects: once 2.0 was in there you could not put 2 in as
 > well.

Good point.  You could delete one and replace it with the other, but
not have both.  That does kind of defeat the whole idea of the
"intern" nomenclature.

Steve
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