[docs] [issue23987] docs about containers membership testing wrong for broken objects

[Jonathan Sharpe]

Jonathan Sharpe added the comment:

I don't think it's as simple as linking to the hashable definition. The "equivalent expression" is simply wrong for dict/set/frozenset, as those types check hash equality, not identity.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23987>
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