[Python-ideas] incremental hashing in __hash__

[jab at math.brown.edu]

Instead of the proposals like "hash.from_iterable()", would it make sense
to allow tuple.__hash__() to accept any iterable, when called as a
classmethod? (And similarly with frozenset.__hash__(), so that the fast C
implementation of that algorithm could be used, rather than the slow
collections.Set._hash() implementation. Then the duplicated implementation
in _collections_abc.py's Set._hash() could be removed completely,
delegating to frozenset.__hash__() instead.)

Would this API more cleanly communicate the algorithm being used and the
implementation, while making a smaller increase in API surface area
compared to introducing a new function?
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