fix: mypy

Author: cmp0xff

pandas-stubs/core/series.pyi

@@ -51,6 +51,7 @@ from pandas.core.api import (
 from pandas.core.arrays import TimedeltaArray
 from pandas.core.arrays.base import ExtensionArray
 from pandas.core.arrays.categorical import CategoricalAccessor
+from pandas.core.arrays.datetimes import DatetimeArray
 from pandas.core.arrays.interval import IntervalArray
 from pandas.core.base import IndexOpsMixin
 from pandas.core.frame import DataFrame
@@ -763,6 +764,9 @@ class Series(IndexOpsMixin[S1], NDFrame):
     ) -> SeriesGroupBy[S1, Any]: ...
     def count(self) -> int: ...
     def mode(self, dropna=...) -> Series[S1]: ...
+    @overload
+    def unique(self: Series[Timestamp]) -> DatetimeArray: ...
+    @overload
     def unique(self) -> np.ndarray: ...
     @overload
     def drop_duplicates(
@@ -2821,7 +2825,7 @@ class TimedeltaSeries(Series[Timedelta]):
         ),
     ) -> Series[float]: ...
     @overload
-    def __rtruediv__(  # type: ignore[override]
+    def __rtruediv__(
         self,
         other: (
             timedelta