ENH: Improved error message and raise new error for small-string NaN … #60907
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…edge case in HDFStore.append (#60829)
Add clearer error messages for datatype mismatch in HDFStore.append. Raise ValueError when nan_rep too large for pytable column. Add and modify applicable test code.
Fix missed tests and correct mistake in error message.
Remove excess comments. Reverse error type change to avoid api changes. Move nan_rep tests into separate function.
(cherry picked from commit 57340ec)
doc/source/whatsnew/vX.X.X.rst
file if fixing a bug or adding a new feature.