[issue20902] Which operand is preferred by set operations? Missing information in the documentation

[R. David Murray]

R. David Murray added the comment:

If you take the intersection or union of a set, it shouldn't matter which set the element "came from", by the axioms that apply to sets.  So it if does, that's an application bug, IMO.

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nosy: +r.david.murray

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<http://bugs.python.org/issue20902>
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