TST/CLN: remove redundant to_json test
Should be covered by the test which follows it since `pd.NA` is in `nulls_fixture`
Awesome thanks! FYI this module is kind of a mess compared to other IO areas. If you are interested in contributing more I think splitting it up into a few separate modules for reading / writing / roundtrip *might* make sense; open to your thoughts > Awesome thanks! FYI this module is kind of a mess compared to other IO areas. If you are interested in contributing more I think splitting it up into a few separate modules for reading / writing / roundtrip _might_ make sense; open to your thoughts

Agreed, will look into it