Reject int-subclass session timestamp values

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

hyperbrowser/models/session.py

@@ -148,6 +148,12 @@ def parse_timestamp(cls, value: Optional[Union[str, int]]) -> Optional[int]:
             raise ValueError(
                 "timestamp values must be integers or plain numeric strings"
             )
+        if type(value) is int:
+            return value
+        if isinstance(value, int):
+            raise ValueError(
+                "timestamp values must be plain integers or plain numeric strings"
+            )
         if type(value) is str:
             try:
                 return int(value)

tests/test_session_models.py

@@ -62,6 +62,20 @@ def test_session_model_preserves_integer_timestamps():
     assert model.end_time == 1735689660
 
 
+def test_session_model_rejects_integer_subclass_timestamps():
+    class _TimestampInt(int):
+        pass
+
+    payload = _build_session_payload()
+    payload["startTime"] = _TimestampInt(1735689600)
+
+    with pytest.raises(
+        ValidationError,
+        match="timestamp values must be plain integers or plain numeric strings",
+    ):
+        Session.model_validate(payload)
+
+
 def test_session_model_rejects_non_integer_timestamp_strings():
     payload = _build_session_payload()
     payload["startTime"] = "not-a-number"