GH ref

pandas-dev · Nov 21, 2023 · 1359776 · 1359776
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diff --git a/doc/source/whatsnew/v2.2.0.rst b/doc/source/whatsnew/v2.2.0.rst
@@ -404,11 +404,11 @@ Strings
 Interval
 ^^^^^^^^
 - Bug in :class:`Interval` ``__repr__`` not displaying UTC offsets for :class:`Timestamp` bounds. Additionally the hour, minute and second components will now be shown. (:issue:`55015`)
+- Bug in :meth:`IntervalIndex.factorize` and :meth:`Series.factorize` with :class:`IntervalDtype` with datetime64 or timedelta64 intervals not preserving non-nanosecond units (:issue:`56099`)
 - Bug in :meth:`IntervalIndex.from_arrays` when passed ``datetime64`` or ``timedelta64`` arrays with mismatched resolutions constructing an invalid ``IntervalArray`` object (:issue:`55714`)
 - Bug in :meth:`IntervalIndex.get_indexer` with datetime or timedelta intervals incorrectly matching on integer targets (:issue:`47772`)
 - Bug in :meth:`IntervalIndex.get_indexer` with timezone-aware datetime intervals incorrectly matching on a sequence of timezone-naive targets (:issue:`47772`)
 - Bug in setting values on a :class:`Series` with an :class:`IntervalIndex` using a slice incorrectly raising (:issue:`54722`)
-- Bug in :meth:`IntervalIndex.factorize` and :meth:`Series.factorize` with :class:`IntervalDtype` with datetime64 or timedelta64 intervals not preserving non-nanosecond units (:issue:`?`)
 -
 
 Indexing

diff --git a/pandas/tests/test_algos.py b/pandas/tests/test_algos.py
@@ -537,6 +537,7 @@ def test_factorize_mixed_values(self, data, expected_codes, expected_uniques):
         tm.assert_index_equal(uniques, expected_uniques)
 
     def test_factorize_interval_non_nano(self, unit):
+        # GH#56099
         left = DatetimeIndex(["2016-01-01", np.nan, "2015-10-11"]).as_unit(unit)
         right = DatetimeIndex(["2016-01-02", np.nan, "2015-10-15"]).as_unit(unit)
         idx = IntervalIndex.from_arrays(left, right)