sort_index raises FutureWarning

[tswast]

tests/compliance/date/test_date_compliance.py::TestMethods::test_value_counts[data_missing-False]
tests/compliance/date/test_date_compliance.py::TestMethods::test_value_counts[data_missing-False]
  /usr/local/Caskroom/miniconda/base/envs/dev-3.9/lib/python3.9/site-packages/pandas/core/indexes/base.py:2177: FutureWarning: Comparison of NaT with datetime.date is deprecated in order to match the standard library behavior. In a future version these will be considered non-comparable.
    return self._engine.is_monotonic_increasing

-- Docs: https://docs.pytest.org/en/stable/warnings.html

[tswast]

Discovered in #84

[tswast]

Bumping down to P3, as I wasn't able to find a quick fix by looking at https://github.com/pandas-dev/pandas/blob/main/pandas/core/arrays/datetimelike.py and it doesn't seem to be affecting correctness.

Also, I see other extension arrays disallow sorting when NA values are present.

https://github.com/pandas-dev/pandas/blob/6033ed4b3383d874ee4a8a461724c0b8c2ca968d/pandas/core/arrays/masked.py#L862-L863

So this particular test might be one we want to disable, anyway?

[tswast]

Possibly fixed in latest pandas, as the warning does not appear with the prerelease dependencies installed.

[chalmerlowe]

This warning no longer appears in the compliance testing and all tests pass.
Closing this issue.