[issue35634] kwargs regression when there are multiple entries with the same key

[iceboy]

iceboy <spam at iceboy.org> added the comment:

I feel like we should not check the argument and allow overriding. If the argument checking is desired, can we also check when there is only a single kwargs? Currently `foo(**d)` still works in Python 3.6 with duplicated keys.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35634>
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