Typed dict throws KeyError when keys contain any UTF-8 character ends with \xb8\x80 #9542

Reporting a bug

Numba typed dict with key type of UnicodeCharSeq() of any length doesn't handle UTF-8 characters end with \xb8\x80 correctly. It seems that any of these characters is casted into empty string when __getitem__ is called, resulting KeyError

Minimum Reproduction Demo

import numba
a = numba.typed.typeddict.Dict.empty(numba.types.UnicodeCharSeq(1), numba.int64)
a['一'] = 10    # \xe4\xb8\x80
print(a)

Error Message

Traceback (most recent call last):
  File "




    
<stdin>", line 1, in <module>
  File "...\.vscode\extensions\ms-python.python-2024.4.1\python_files\pythonrc.py", line 22, in my_displayhook
    self.original_displayhook(value)
  File "...\mamba\lib\site-packages\numba\typed\typeddict.py", line 217, in __repr__
    body = str(self)
  File "...\mamba\lib\site-packages\numba\typed\typeddict.py", line 212, in __str__
    for k, v in self.items():
  File "...\mamba\lib\_collections_abc.py", line 911, in __iter__
    yield (key, self._mapping[key])
  File "...\mamba\lib\site-packages\numba\typed\typeddict.py", line 180, in __getitem__
    return _getitem(self, key)
  File "...\mamba\lib\site-packages\numba\typed\dictobject.py", line 783, in impl
    raise KeyError()
KeyError

numba 0.59.1