fix: reduce ignore

Author: cmp0xff

tests/series/arithmetic/test_sub.py

@@ -141,7 +141,7 @@ def test_sub_pd_series() -> None:
 
 
 def test_sub_py_datetime() -> None:
-    """Test pd.Series[Any] - Python native datetime(s)"""
+    """Test pd.Series[Any] - Python native datetime"""
     s = anchor
 
     check(assert_type(left_ts - s, "TimedeltaSeries"), pd.Series, pd.Timedelta)
@@ -156,22 +156,22 @@ def test_sub_py_datetime() -> None:
 def test_sub_numpy_datetime() -> None:
     """Test pd.Series[Any] - numpy datetime(s)"""
     s = np.datetime64(anchor)
-    a = np.array([s + np.timedelta64(m, "m") for m in range(3)])
+    a = np.array([s + np.timedelta64(m, "m") for m in range(3)], dtype=np.datetime64)
 
-    # `numpy` typing gives the corresponding `ndarray`s in the static type
-    # checking, where our `__rsub__` cannot override. At runtime, they return
-    # `Series`s.
     check(assert_type(left_ts - s, "TimedeltaSeries"), pd.Series, pd.Timedelta)
-    check(assert_type(left_ts - a, "TimedeltaSeries"), pd.Series, pd.Timedelta)  # type: ignore[assert-type]
+    check(assert_type(left_ts - a, "TimedeltaSeries"), pd.Series, pd.Timedelta)
 
     check(assert_type(s - left_ts, "TimedeltaSeries"), pd.Series, pd.Timedelta)
+    # `numpy` typing gives the corresponding `ndarray`s in the static type
+    # checking, where our `__rsub__` cannot override. At runtime, they return
+    # `Series`s.
     check(assert_type(a - left_ts, "npt.NDArray[np.datetime64]"), pd.Series, pd.Timedelta)  # type: ignore[assert-type]
 
     check(assert_type(left_ts.sub(s), "TimedeltaSeries"), pd.Series, pd.Timedelta)
-    check(assert_type(left_ts.sub(a), "TimedeltaSeries"), pd.Series, pd.Timedelta)  # type: ignore[assert-type]
+    check(assert_type(left_ts.sub(a), "TimedeltaSeries"), pd.Series, pd.Timedelta)
 
     check(assert_type(left_ts.rsub(s), "TimedeltaSeries"), pd.Series, pd.Timedelta)
-    check(assert_type(left_ts.rsub(a), "TimedeltaSeries"), pd.Series, pd.Timedelta)  # type: ignore[assert-type]
+    check(assert_type(left_ts.rsub(a), "TimedeltaSeries"), pd.Series, pd.Timedelta)
 
 
 def test_sub_pd_datetime() -> None: