[issue42033] Seemingly unnecessary complexification of foo(**kw)

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

Have you observed any slowdown or incorrect behaviour?

The 3.8 bytecode looks incorrect to me.
The C-API documentation doesn't prohibit callables from mutating the dictionary they receive.
Unless a copy is made, then a callee could mutate `var`.

https://docs.python.org/3/c-api/call.html

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<https://bugs.python.org/issue42033>
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