[issue29312] Use FASTCALL in dict.update()

[Jeroen Demeyer]

Jeroen Demeyer <J.Demeyer at UGent.be> added the comment:

> d2 must be converted to 2 lists (kwnames and args) and then a new dict should be created.

The last part is not necessarily true. You could do the update directly, without having that intermediate dict.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29312>
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