cython

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# define a global name for whatever char type is used in the module
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char_type = cython.typedef(cython.uchar)
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@cython.cfunc
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def _chars(s) -> char_type[:]:
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    if isinstance(s, str):
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        # encode to the specific encoding used inside of the module
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        s = cython.cast(str, s).encode('utf8')
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    return s
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