diff --git a/bigframes/core/rewrite/timedeltas.py b/bigframes/core/rewrite/timedeltas.py
index bf3c0ee639..ea8e608a84 100644
--- a/bigframes/core/rewrite/timedeltas.py
+++ b/bigframes/core/rewrite/timedeltas.py
@@ -111,7 +111,7 @@ def _rewrite_expressions(expr: ex.Expression, schema: schema.ArraySchema) -> _Ty
 
 
 def _rewrite_scalar_constant_expr(expr: ex.ScalarConstantExpression) -> _TypedExpr:
-    if expr.dtype is dtypes.TIMEDELTA_DTYPE:
+    if expr.dtype == dtypes.TIMEDELTA_DTYPE:
         int_repr = utils.timedelta_to_micros(expr.value)  # type: ignore
         return _TypedExpr(ex.const(int_repr, expr.dtype), expr.dtype)
 
@@ -148,31 +148,31 @@ def _rewrite_sub_op(left: _TypedExpr, right: _TypedExpr) -> _TypedExpr:
     if dtypes.is_datetime_like(left.dtype) and dtypes.is_datetime_like(right.dtype):
         return _TypedExpr.create_op_expr(ops.timestamp_diff_op, left, right)
 
-    if dtypes.is_datetime_like(left.dtype) and right.dtype is dtypes.TIMEDELTA_DTYPE:
+    if dtypes.is_datetime_like(left.dtype) and right.dtype == dtypes.TIMEDELTA_DTYPE:
         return _TypedExpr.create_op_expr(ops.timestamp_sub_op, left, right)
 
     if left.dtype == dtypes.DATE_DTYPE and right.dtype == dtypes.DATE_DTYPE:
         return _TypedExpr.create_op_expr(ops.date_diff_op, left, right)
 
-    if left.dtype == dtypes.DATE_DTYPE and right.dtype is dtypes.TIMEDELTA_DTYPE:
+    if left.dtype == dtypes.DATE_DTYPE and right.dtype == dtypes.TIMEDELTA_DTYPE:
         return _TypedExpr.create_op_expr(ops.date_sub_op, left, right)
 
     return _TypedExpr.create_op_expr(ops.sub_op, left, right)
 
 
 def _rewrite_add_op(left: _TypedExpr, right: _TypedExpr) -> _TypedExpr:
-    if dtypes.is_datetime_like(left.dtype) and right.dtype is dtypes.TIMEDELTA_DTYPE:
+    if dtypes.is_datetime_like(left.dtype) and right.dtype == dtypes.TIMEDELTA_DTYPE:
         return _TypedExpr.create_op_expr(ops.timestamp_add_op, left, right)
 
-    if left.dtype is dtypes.TIMEDELTA_DTYPE and dtypes.is_datetime_like(right.dtype):
+    if left.dtype == dtypes.TIMEDELTA_DTYPE and dtypes.is_datetime_like(right.dtype):
         # Re-arrange operands such that timestamp is always on the left and timedelta is
         # always on the right.
         return _TypedExpr.create_op_expr(ops.timestamp_add_op, right, left)
 
-    if left.dtype == dtypes.DATE_DTYPE and right.dtype is dtypes.TIMEDELTA_DTYPE:
+    if left.dtype == dtypes.DATE_DTYPE and right.dtype == dtypes.TIMEDELTA_DTYPE:
         return _TypedExpr.create_op_expr(ops.date_add_op, left, right)
 
-    if left.dtype is dtypes.TIMEDELTA_DTYPE and right.dtype == dtypes.DATE_DTYPE:
+    if left.dtype == dtypes.TIMEDELTA_DTYPE and right.dtype == dtypes.DATE_DTYPE:
         # Re-arrange operands such that date is always on the left and timedelta is
         # always on the right.
         return _TypedExpr.create_op_expr(ops.date_add_op, right, left)
@@ -183,9 +183,9 @@ def _rewrite_add_op(left: _TypedExpr, right: _TypedExpr) -> _TypedExpr:
 def _rewrite_mul_op(left: _TypedExpr, right: _TypedExpr) -> _TypedExpr:
     result = _TypedExpr.create_op_expr(ops.mul_op, left, right)
 
-    if left.dtype is dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right.dtype):
+    if left.dtype == dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right.dtype):
         return _TypedExpr.create_op_expr(ops.timedelta_floor_op, result)
-    if dtypes.is_numeric(left.dtype) and right.dtype is dtypes.TIMEDELTA_DTYPE:
+    if dtypes.is_numeric(left.dtype) and right.dtype == dtypes.TIMEDELTA_DTYPE:
         return _TypedExpr.create_op_expr(ops.timedelta_floor_op, result)
 
     return result
@@ -194,7 +194,7 @@ def _rewrite_mul_op(left: _TypedExpr, right: _TypedExpr) -> _TypedExpr:
 def _rewrite_div_op(left: _TypedExpr, right: _TypedExpr) -> _TypedExpr:
     result = _TypedExpr.create_op_expr(ops.div_op, left, right)
 
-    if left.dtype is dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right.dtype):
+    if left.dtype == dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right.dtype):
         return _TypedExpr.create_op_expr(ops.timedelta_floor_op, result)
 
     return result
@@ -203,14 +203,14 @@ def _rewrite_div_op(left: _TypedExpr, right: _TypedExpr) -> _TypedExpr:
 def _rewrite_floordiv_op(left: _TypedExpr, right: _TypedExpr) -> _TypedExpr:
     result = _TypedExpr.create_op_expr(ops.floordiv_op, left, right)
 
-    if left.dtype is dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right.dtype):
+    if left.dtype == dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right.dtype):
         return _TypedExpr.create_op_expr(ops.timedelta_floor_op, result)
 
     return result
 
 
 def _rewrite_to_timedelta_op(op: ops.ToTimedeltaOp, arg: _TypedExpr):
-    if arg.dtype is dtypes.TIMEDELTA_DTYPE:
+    if arg.dtype == dtypes.TIMEDELTA_DTYPE:
         # Do nothing for values that are already timedeltas
         return arg
 
@@ -239,19 +239,19 @@ def _rewrite_aggregation(
                 aggs.DateSeriesDiffOp(aggregation.op.periods), aggregation.arg
             )
 
-    if isinstance(aggregation.op, aggs.StdOp) and input_type is dtypes.TIMEDELTA_DTYPE:
+    if isinstance(aggregation.op, aggs.StdOp) and input_type == dtypes.TIMEDELTA_DTYPE:
         return ex.UnaryAggregation(
             aggs.StdOp(should_floor_result=True), aggregation.arg
         )
 
-    if isinstance(aggregation.op, aggs.MeanOp) and input_type is dtypes.TIMEDELTA_DTYPE:
+    if isinstance(aggregation.op, aggs.MeanOp) and input_type == dtypes.TIMEDELTA_DTYPE:
         return ex.UnaryAggregation(
             aggs.MeanOp(should_floor_result=True), aggregation.arg
         )
 
     if (
         isinstance(aggregation.op, aggs.QuantileOp)
-        and input_type is dtypes.TIMEDELTA_DTYPE
+        and input_type == dtypes.TIMEDELTA_DTYPE
     ):
         return ex.UnaryAggregation(
             aggs.QuantileOp(q=aggregation.op.q, should_floor_result=True),
diff --git a/bigframes/operations/aggregations.py b/bigframes/operations/aggregations.py
index a714f5804c..0ae4516dfd 100644
--- a/bigframes/operations/aggregations.py
+++ b/bigframes/operations/aggregations.py
@@ -142,7 +142,7 @@ class SumOp(UnaryAggregateOp):
     name: ClassVar[str] = "sum"
 
     def output_type(self, *input_types: dtypes.ExpressionType) -> dtypes.ExpressionType:
-        if input_types[0] is dtypes.TIMEDELTA_DTYPE:
+        if input_types[0] == dtypes.TIMEDELTA_DTYPE:
             return dtypes.TIMEDELTA_DTYPE
 
         if dtypes.is_numeric(input_types[0]):
@@ -185,7 +185,7 @@ def order_independent(self) -> bool:
         return True
 
     def output_type(self, *input_types: dtypes.ExpressionType) -> dtypes.ExpressionType:
-        if input_types[0] is dtypes.TIMEDELTA_DTYPE:
+        if input_types[0] == dtypes.TIMEDELTA_DTYPE:
             return dtypes.TIMEDELTA_DTYPE
         return signatures.UNARY_REAL_NUMERIC.output_type(input_types[0])
 
@@ -233,7 +233,7 @@ class MeanOp(UnaryAggregateOp):
     should_floor_result: bool = False
 
     def output_type(self, *input_types: dtypes.ExpressionType) -> dtypes.ExpressionType:
-        if input_types[0] is dtypes.TIMEDELTA_DTYPE:
+        if input_types[0] == dtypes.TIMEDELTA_DTYPE:
             return dtypes.TIMEDELTA_DTYPE
         return signatures.UNARY_REAL_NUMERIC.output_type(input_types[0])
 
@@ -275,7 +275,7 @@ class StdOp(UnaryAggregateOp):
     should_floor_result: bool = False
 
     def output_type(self, *input_types: dtypes.ExpressionType) -> dtypes.ExpressionType:
-        if input_types[0] is dtypes.TIMEDELTA_DTYPE:
+        if input_types[0] == dtypes.TIMEDELTA_DTYPE:
             return dtypes.TIMEDELTA_DTYPE
 
         return signatures.FixedOutputType(
diff --git a/bigframes/operations/numeric_ops.py b/bigframes/operations/numeric_ops.py
index ae23aff707..d06d6eb336 100644
--- a/bigframes/operations/numeric_ops.py
+++ b/bigframes/operations/numeric_ops.py
@@ -124,9 +124,9 @@ def output_type(self, *input_types):
             return input_types[0]
 
         # Temporal addition.
-        if dtypes.is_datetime_like(left_type) and right_type is dtypes.TIMEDELTA_DTYPE:
+        if dtypes.is_datetime_like(left_type) and right_type == dtypes.TIMEDELTA_DTYPE:
             return left_type
-        if left_type is dtypes.TIMEDELTA_DTYPE and dtypes.is_datetime_like(right_type):
+        if left_type == dtypes.TIMEDELTA_DTYPE and dtypes.is_datetime_like(right_type):
             return right_type
 
         if left_type == dtypes.DATE_DTYPE and right_type == dtypes.TIMEDELTA_DTYPE:
@@ -135,7 +135,7 @@ def output_type(self, *input_types):
         if left_type == dtypes.TIMEDELTA_DTYPE and right_type == dtypes.DATE_DTYPE:
             return dtypes.DATETIME_DTYPE
 
-        if left_type is dtypes.TIMEDELTA_DTYPE and right_type is dtypes.TIMEDELTA_DTYPE:
+        if left_type == dtypes.TIMEDELTA_DTYPE and right_type == dtypes.TIMEDELTA_DTYPE:
             return dtypes.TIMEDELTA_DTYPE
 
         if (left_type is None or dtypes.is_numeric(left_type)) and (
@@ -164,13 +164,13 @@ def output_type(self, *input_types):
         if left_type == dtypes.DATE_DTYPE and right_type == dtypes.DATE_DTYPE:
             return dtypes.TIMEDELTA_DTYPE
 
-        if dtypes.is_datetime_like(left_type) and right_type is dtypes.TIMEDELTA_DTYPE:
+        if dtypes.is_datetime_like(left_type) and right_type == dtypes.TIMEDELTA_DTYPE:
             return left_type
 
         if left_type == dtypes.DATE_DTYPE and right_type == dtypes.TIMEDELTA_DTYPE:
             return dtypes.DATETIME_DTYPE
 
-        if left_type is dtypes.TIMEDELTA_DTYPE and right_type is dtypes.TIMEDELTA_DTYPE:
+        if left_type == dtypes.TIMEDELTA_DTYPE and right_type == dtypes.TIMEDELTA_DTYPE:
             return dtypes.TIMEDELTA_DTYPE
 
         if (left_type is None or dtypes.is_numeric(left_type)) and (
@@ -193,9 +193,9 @@ def output_type(self, *input_types: dtypes.ExpressionType) -> dtypes.ExpressionT
         left_type = input_types[0]
         right_type = input_types[1]
 
-        if left_type is dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right_type):
+        if left_type == dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right_type):
             return dtypes.TIMEDELTA_DTYPE
-        if dtypes.is_numeric(left_type) and right_type is dtypes.TIMEDELTA_DTYPE:
+        if dtypes.is_numeric(left_type) and right_type == dtypes.TIMEDELTA_DTYPE:
             return dtypes.TIMEDELTA_DTYPE
 
         if (left_type is None or dtypes.is_numeric(left_type)) and (
@@ -217,10 +217,10 @@ def output_type(self, *input_types: dtypes.ExpressionType) -> dtypes.ExpressionT
         left_type = input_types[0]
         right_type = input_types[1]
 
-        if left_type is dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right_type):
+        if left_type == dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right_type):
             return dtypes.TIMEDELTA_DTYPE
 
-        if left_type is dtypes.TIMEDELTA_DTYPE and right_type is dtypes.TIMEDELTA_DTYPE:
+        if left_type == dtypes.TIMEDELTA_DTYPE and right_type == dtypes.TIMEDELTA_DTYPE:
             return dtypes.FLOAT_DTYPE
 
         if (left_type is None or dtypes.is_numeric(left_type)) and (
@@ -244,10 +244,10 @@ def output_type(self, *input_types: dtypes.ExpressionType) -> dtypes.ExpressionT
         left_type = input_types[0]
         right_type = input_types[1]
 
-        if left_type is dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right_type):
+        if left_type == dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right_type):
             return dtypes.TIMEDELTA_DTYPE
 
-        if left_type is dtypes.TIMEDELTA_DTYPE and right_type is dtypes.TIMEDELTA_DTYPE:
+        if left_type == dtypes.TIMEDELTA_DTYPE and right_type == dtypes.TIMEDELTA_DTYPE:
             return dtypes.INT_DTYPE
 
         if (left_type is None or dtypes.is_numeric(left_type)) and (
diff --git a/bigframes/operations/timedelta_ops.py b/bigframes/operations/timedelta_ops.py
index b831e3f864..5e9a1189e4 100644
--- a/bigframes/operations/timedelta_ops.py
+++ b/bigframes/operations/timedelta_ops.py
@@ -46,7 +46,7 @@ class TimedeltaFloorOp(base_ops.UnaryOp):
 
     def output_type(self, *input_types: dtypes.ExpressionType) -> dtypes.ExpressionType:
         input_type = input_types[0]
-        if dtypes.is_numeric(input_type) or input_type is dtypes.TIMEDELTA_DTYPE:
+        if dtypes.is_numeric(input_type) or input_type == dtypes.TIMEDELTA_DTYPE:
             return dtypes.TIMEDELTA_DTYPE
         raise TypeError(f"unsupported type: {input_type}")
 
@@ -62,11 +62,11 @@ def output_type(self, *input_types: dtypes.ExpressionType) -> dtypes.ExpressionT
         # timestamp + timedelta => timestamp
         if (
             dtypes.is_datetime_like(input_types[0])
-            and input_types[1] is dtypes.TIMEDELTA_DTYPE
+            and input_types[1] == dtypes.TIMEDELTA_DTYPE
         ):
             return input_types[0]
         # timedelta + timestamp => timestamp
-        if input_types[0] is dtypes.TIMEDELTA_DTYPE and dtypes.is_datetime_like(
+        if input_types[0] == dtypes.TIMEDELTA_DTYPE and dtypes.is_datetime_like(
             input_types[1]
         ):
             return input_types[1]
@@ -87,7 +87,7 @@ def output_type(self, *input_types: dtypes.ExpressionType) -> dtypes.ExpressionT
         # timestamp - timedelta => timestamp
         if (
             dtypes.is_datetime_like(input_types[0])
-            and input_types[1] is dtypes.TIMEDELTA_DTYPE
+            and input_types[1] == dtypes.TIMEDELTA_DTYPE
         ):
             return input_types[0]
 
diff --git a/tests/system/small/operations/test_timedeltas.py b/tests/system/small/operations/test_timedeltas.py
index 53cb5f7419..0cf394e454 100644
--- a/tests/system/small/operations/test_timedeltas.py
+++ b/tests/system/small/operations/test_timedeltas.py
@@ -58,7 +58,8 @@ def temporal_dfs(session):
                 pd.Timedelta(-4, "m"),
                 pd.Timedelta(6, "h"),
             ],
-            "numeric_col": [1.5, 2, -3],
+            "float_col": [1.5, 2, -3],
+            "int_col": [1, 2, -3],
         }
     )
 
@@ -92,10 +93,10 @@ def _assert_series_equal(actual: pd.Series, expected: pd.Series):
         (operator.sub, "timedelta_col_1", "timedelta_col_2"),
         (operator.truediv, "timedelta_col_1", "timedelta_col_2"),
         (operator.floordiv, "timedelta_col_1", "timedelta_col_2"),
-        (operator.truediv, "timedelta_col_1", "numeric_col"),
-        (operator.floordiv, "timedelta_col_1", "numeric_col"),
-        (operator.mul, "timedelta_col_1", "numeric_col"),
-        (operator.mul, "numeric_col", "timedelta_col_1"),
+        (operator.truediv, "timedelta_col_1", "float_col"),
+        (operator.floordiv, "timedelta_col_1", "float_col"),
+        (operator.mul, "timedelta_col_1", "float_col"),
+        (operator.mul, "float_col", "timedelta_col_1"),
     ],
 )
 def test_timedelta_binary_ops_between_series(temporal_dfs, op, col_1, col_2):
@@ -117,7 +118,7 @@ def test_timedelta_binary_ops_between_series(temporal_dfs, op, col_1, col_2):
         (operator.truediv, "timedelta_col_1", 3),
         (operator.floordiv, "timedelta_col_1", 3),
         (operator.mul, "timedelta_col_1", 3),
-        (operator.mul, "numeric_col", pd.Timedelta(1, "s")),
+        (operator.mul, "float_col", pd.Timedelta(1, "s")),
     ],
 )
 def test_timedelta_binary_ops_series_and_literal(temporal_dfs, op, col, literal):
@@ -136,10 +137,10 @@ def test_timedelta_binary_ops_series_and_literal(temporal_dfs, op, col, literal)
         (operator.sub, "timedelta_col_1", pd.Timedelta(2, "s")),
         (operator.truediv, "timedelta_col_1", pd.Timedelta(2, "s")),
         (operator.floordiv, "timedelta_col_1", pd.Timedelta(2, "s")),
-        (operator.truediv, "numeric_col", pd.Timedelta(2, "s")),
-        (operator.floordiv, "numeric_col", pd.Timedelta(2, "s")),
+        (operator.truediv, "float_col", pd.Timedelta(2, "s")),
+        (operator.floordiv, "float_col", pd.Timedelta(2, "s")),
         (operator.mul, "timedelta_col_1", 3),
-        (operator.mul, "numeric_col", pd.Timedelta(1, "s")),
+        (operator.mul, "float_col", pd.Timedelta(1, "s")),
     ],
 )
 def test_timedelta_binary_ops_literal_and_series(temporal_dfs, op, col, literal):
@@ -181,6 +182,16 @@ def test_timestamp_add__ts_series_plus_td_series(temporal_dfs, column, pd_dtype)
     )
 
 
+@pytest.mark.parametrize("column", ["datetime_col", "timestamp_col"])
+def test_timestamp_add__ts_series_plus_td_series__explicit_cast(temporal_dfs, column):
+    bf_df, _ = temporal_dfs
+    dtype = pd.ArrowDtype(pa.duration("us"))
+
+    actual_result = bf_df[column] + bf_df["int_col"].astype(dtype)
+
+    assert len(actual_result) > 0
+
+
 @pytest.mark.parametrize(
     "literal",
     [