[docs] [issue28383] __hash__ documentation recommends naive XOR to combine but this is suboptimal

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

This makes sense.  Note that this is the way hashes are implemented for the datetime objects: <https://hg.python.org/cpython/file/v3.6.0b1/Lib/datetime.py#l635>.

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nosy: +belopolsky

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