[Raymond Hettinger]
> Arghh. One more example always arises after going to bed.
>
> The original required only equality. The new version requires
> equality, hashability, *and* weak referencability.
It always required (and still does) all three for __setitem__ and
__getitem__: key equality and hashability are required for all dicts, and
*of course* key weak referencability is required for a weak-keyed dict:
that's why it's called a weak-keyed dict <0.5 wink>.
__delitem__ alone used a bizarre algorithm, and indeed one that broke other
normal dict invariants such as that
del d[k]
always deletes the same (key, value) pair that
d[k] = v
would have replaced.
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