[issue29312] Use FASTCALL in dict.update()

[Jeroen Demeyer]

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

> How can we avoid unpacking dict in case of d1.update(**d2)?

We cannot. However, how common is that call? One could argue that we should optimize for the more common case of d1.update(d2).

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