[issue45105] Incorrect handling of unicode character \U00010900

[Max Bachmann]

Max Bachmann <kontakt at maxbachmann.de> added the comment:

This is the result of copy pasting example posted above on windows using 
```
Python 3.7.8 (tags/v3.7.8:4b47a5b6ba, Jun 28 2020, 08:53:46) [MSC v.1916 64 bit (AMD64)] on win32
```
which appears to run into similar problems:
```
>>> s = '0��00'                                                                                                                                                                                                                                                                                                                                           >>> s                                                                                                                                                                                                                                                                                                                                                     '0𐤀00'                                                                                                                                                                                                                                                                                                                                                    >>> ls = list(s)                                                                                                                                                                                                                                                                                                                                          >>> ls                                                                                                                                                                                                                                                                                                                                                    ['0', '𐤀', '0', '0']                                                                                                                                                                                                                                                                                                                                      >>> s[0]                                                                                                                                                                                                                                                                                                                                                  '0'                                                                                                                                                                                                                                                                                                                                                       >>> s[1]                                                                                                                                                                                                                                                                                                                                                  '𐤀'
```

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45105>
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