[Adam]
> Given that "x in {1,2,3}" can be optimized just as well with mutable
> sets (can somebody think of an example that can't?), do you still
> support immutable using the literal notation?
>From an optimization point of view, it is still best to have {...} as a
>frozenset.
However, my support for it has waned anyway. The notation is also
used for set comprehension and those should be mutable.
Raymond
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