[issue27358] BUILD_MAP_UNPACK_WITH_CALL is slow

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The problem is that var-keyword argument can be not a dict, but general mapping. This optimization is applicable only if it is a dict.

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stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27358>
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