No, not true.
Key values cannot be mutated while used in a collection, period.
Correct.
Excuse my intrusion in this discussion, but I don't really
understand why 'isEqual:' and 'compare:' results must not change
when an object is used as key.
My though was that as long as the hash remain the same, it should
not be an issue. I don't see any case where it may be useful, but
don't see why it would be illegal ?
Forget my question, I just see this comment from Quincey which give me
an answer.
[Actually, for all I know, key values *can* be mutated while used in a
collection, provided the hash value doesn't change, but even if it
technically feasible it sounds so un-useful I'd argue it's better just
to assert that it's not allowed.]
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