add repro case?

[emfdavid]

I tried to add this as a repro case for the issue I see in #528 where I have to use engine='fastparquet' to successfully read a file with timedelta64 types... but I can't repro the issue.

        test_path = os.path.join(
            THIS_DIR, "grib_idx_fixtures", sample_prefix, "kerchunk_index.parquet"
        )
        expected = pd.read_parquet(test_path) #, engine="fastparquet")
>       pd.testing.assert_frame_equal(k_index, expected)
E       AssertionError: Attributes of DataFrame.iloc[:, 4] (column name="step") are different
E
E       Attribute "dtype" are different
E       [left]:  timedelta64[ns]
E       [right]: object

[emfdavid]

I am going to close this - let me know if you want help to investigate further at some point.