⚡️ Speed up method Info.__class_getitem__ by 12% in PR #3996 (feature/annotated)

strawberry/types/info.py

@@ -77,10 +77,13 @@ def __class_getitem__(cls, types: Union[type, tuple[type, ...]]) -> type[Info]:
         See:
         https://discuss.python.org/t/passing-only-one-typevar-of-two-when-using-defaults/49134
         """
-        if not isinstance(types, tuple):
-            types = (types, Any)  # type: ignore
-
-        return super().__class_getitem__(types)  # type: ignore
+        # Fast path: if types is already a tuple of length 2, avoid allocation/modification
+        if isinstance(types, tuple):
+            # Only coerce if it's a tuple of length 1 (for legacy compatibility); else, pass as-is
+            if len(types) == 1:
+                types = (types[0], Any)
+            return super().__class_getitem__(types)  # type: ignore
+        return super().__class_getitem__((types, Any))  # type: ignore
 
     @property
     def field_name(self) -> str:

strawberry/utils/typing.py

@@ -130,10 +130,7 @@ def is_concrete_generic(annotation: type) -> bool:
 
 
 def is_generic_subclass(annotation: type) -> bool:
-    return isinstance(annotation, type) and issubclass(
-        annotation,
-        Generic,  # type:ignore
-    )
+    return isinstance(annotation, type) and issubclass(annotation, Generic)
 
 
 def is_generic(annotation: type) -> bool:
@@ -185,7 +182,7 @@ def get_parameters(annotation: type) -> Union[tuple[object], tuple[()]]:
         and issubclass(annotation, Generic)  # type:ignore
         and annotation is not Generic
     ):
-        return annotation.__parameters__  # type: ignore[union-attr]
+        return annotation.__parameters__
     return ()  # pragma: no cover