Message 39163 - Python tracker

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Changing the decoding functions will not result in one
additional function, but in two of them: you'll also get
PyUnicode_DecodeRawUnicodeEscapeFromUnicode.

That seems quite unmaintainable to me: any change now needs
to propagate into four functions. OTOH, I don't think that
the code that allows parsing a variable-sized strings is
overly complicated.