[issue24214] UTF-8 incremental decoder doesn't support surrogatepass correctly

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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versions: +Python 3.7 -Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue24214>
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