[issue19431] Document PyFrame_FastToLocals() and PyFrame_FastToLocalsWithError()

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> Currently you should call PyFrame_FastToLocalsWithError(), modify directly f_locals, and call PyFrame_LocalsToFast().

When happens if PyFrame_LocalsToFast() isn't called? Does it crash or is it just slower?

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<https://bugs.python.org/issue19431>
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