[issue14923] Even faster UTF-8 decoding

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

The C standard says, in 6.3.1.3/3

Otherwise [*], the new type is signed and the value cannot be represented in it; either the result is implementation-defined or an implementation-defined signal is raised.

[*]: the value cannot be exactly converted, and the target type is not unsigned.

We shouldn't be using unsigned->signed conversions where the source value is out of range for the signed type.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14923>
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