fix: non-native class

BobTheBuidler · web-flow · commit 40876a84e1db · 2025-11-17T14:15:25.000-04:00
diff --git a/mypyc/irbuild/ll_builder.py b/mypyc/irbuild/ll_builder.py
@@ -701,7 +701,7 @@ def isinstance_native(self, obj: Value, class_ir: ClassIR, line: int) -> Value:
         even faster type comparison checks `type(obj) is typ`.
         """
         concrete = all_concrete_classes(class_ir)
-        if concrete is None or len(concrete) > FAST_ISINSTANCE_MAX_SUBCLASSES + 1:
+        if not class_ir.is_ext_class or concrete is None or len(concrete) > FAST_ISINSTANCE_MAX_SUBCLASSES + 1:
             return self.primitive_op(
                 fast_isinstance_op, [obj, self.get_native_type(class_ir)], line
             )

Original file line number	Diff line number	Diff line change
`@@ -701,7 +701,7 @@ def isinstance_native(self, obj: Value, class_ir: ClassIR, line: int) -> Value:`
`701`	`701`	even faster type comparison checks `type(obj) is typ`.
`702`	`702`	`"""`
`703`	`703`	`concrete = all_concrete_classes(class_ir)`
`704`		`- if concrete is None or len(concrete) > FAST_ISINSTANCE_MAX_SUBCLASSES + 1:`
	`704`	`+ if not class_ir.is_ext_class or concrete is None or len(concrete) > FAST_ISINSTANCE_MAX_SUBCLASSES + 1:`
`705`	`705`	`return self.primitive_op(`
`706`	`706`	`fast_isinstance_op, [obj, self.get_native_type(class_ir)], line`
`707`	`707`	`)`