Warning raised by to_stata on a category column that contains non-string values.
Examples
>>> df = pd.DataFrame({"categories": pd.Series(["a", 2], dtype="category")})
>>> df.to_stata('test')
... # ValueLabelTypeMismatch: Stata value labels (pandas categories) must be str...
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https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.errors.ValueLabelTypeMismatch.html