INADA Naoki <songofaca...@gmail.com> added the comment:

We have it already:

https://docs.python.org/3/library/stdtypes.html#mapping-types-dict

> A dictionary’s keys are almost arbitrary values. Values that are not 
> hashable, that is, values containing lists, dictionaries or other mutable 
> types (that are compared by value rather than by object identity) may not be 
> used as keys.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32899>
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