BUG: ndarray[td64] // TimedeltaArray (pandas-dev#36646)

Author: jbrockmendel

pandas/core/arrays/timedeltas.py

@@ -689,13 +689,12 @@ def __rfloordiv__(self, other):
 
         elif is_timedelta64_dtype(other.dtype):
             other = type(self)(other)
-
             # numpy timedelta64 does not natively support floordiv, so operate
             #  on the i8 values
             result = other.asi8 // self.asi8
             mask = self._isnan | other._isnan
             if mask.any():
-                result = result.astype(np.int64)
+                result = result.astype(np.float64)
                 result[mask] = np.nan
             return result
 

pandas/tests/arithmetic/test_timedelta64.py

@@ -1750,6 +1750,10 @@ def test_td64arr_floordiv_td64arr_with_nat(self, box_with_array):
 
         tm.assert_equal(result, expected)
 
+        # case that goes through __rfloordiv__ with arraylike
+        result = np.asarray(left) // right
+        tm.assert_equal(result, expected)
+
     def test_td64arr_floordiv_tdscalar(self, box_with_array, scalar_td):
         # GH#18831
         td1 = Series([timedelta(minutes=5, seconds=3)] * 3)