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Author: crusaderky

src/array_api_extra/_lib/_utils/_helpers.py

@@ -396,6 +396,10 @@ class Pickler(pickle.Pickler):  # numpydoc ignore=GL01,RT01
 
         @override
         def persistent_id(self, obj: object) -> object:  # pyright: ignore[reportIncompatibleMethodOverride]  # numpydoc ignore=GL08
+
+            # Fast exit in case of basic builtin types.
+            # Note that basic collections (tuple, list, etc.) are in this;
+            # persistent_id() will be called again with their contents.
             if type(obj) in _BASIC_TYPES:  # No subclasses!
                 return None