Rémi Lapeyre <remi.lape...@henki.fr> added the comment:

The set is converted to a frozenset before the comparison so 

>>> {1,2} in {frozenset({1,2}), 3}

is equivalent to 

>>> frozenset({1,2}) in {frozenset({1,2}), 3}


This was introduced on purpose 17 years ago in 19c2d778 so it's unlikely to 
change.

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nosy: +remi.lapeyre

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<https://bugs.python.org/issue40853>
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