repr(string) escapes some codepoints which CPython does not
For example:
$ pypy3
Python 3.6.12 (db1e853f94de42ad711bd930222bd2434e0f900d, Nov 22 2020, 10:40:24)
[PyPy 7.3.3 with GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>> '\U0001f42a'
'\U0001f42a'
$ python3.6
Python 3.6.9 (default, Oct 8 2020, 12:12:24)
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> '\U0001f42a'
'🐪'
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