[kevin9327]

Pull Request Check List

• Added tests for changed code.
• Updated documentation for changed code. (no doc change needed)

A negative duration shorter than a second loses its sign in in_words():

>>> pendulum.duration(seconds=-1).in_words()
'-1 second'
>>> pendulum.duration(microseconds=-123456).in_words()
'0.12 seconds'   # expected '-0.12 seconds'

The same happens for an interval whose end is less than a second before its start ('0.12 second'). Longer negative values already keep their sign (test_singular_negative_values expects -1 day). The sub-second branch formatted abs(self.microseconds), and microseconds is the only place the sign is kept for these values.

The fix formats self.microseconds without abs() in both Duration.in_words() and Interval.in_words(). Positive values and the zero case (0 microseconds) are unchanged.

Tests: added test_negative_subseconds to tests/duration/test_in_words.py and tests/interval/test_in_words.py. Both fail before the fix and pass after it. The full suite has 1872 passed and 1 failed here, run with PENDULUM_EXTENSIONS=0. The failure is tests/test_main.py::test_instance_with_aware_datetime_any_tzinfo, which also fails on master in this environment. ruff check and ruff format --check (v0.14.11, the pinned version) pass.

I wrote this change with help from an AI assistant. I reviewed it and ran the tests listed above.