[issue19219] speed up marshal.loads()

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Sorry for sarcasm.

Well, indeed, the sarcasm is undeserved here, if the interpreter cannot
crash because of the change.

> > It's exactly what you suggest: reuse PyUnicode_AsUTF8String().
> 
> Actually _PyUnicode_UTF8(). PyUnicode_AsUTF8String() creates UTF8
> cache if it is not exists and this can be not desired. We could use
> this optimization in many other places, in particular in
> PyUnicode_AsUTF8String() itself.

I don't understand how _PyUnicode_UTF8() can be used for *unmarshalling*.

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<http://bugs.python.org/issue19219>
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