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-rw-r--r--py/runtime.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/py/runtime.c b/py/runtime.c
index 0de161b08b..9d41f059f5 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -518,7 +518,7 @@ mp_obj_t rt_binary_op(int op, mp_obj_t lhs, mp_obj_t rhs) {
if (mp_obj_is_exception_instance(lhs)) {
lhs = mp_obj_get_type(lhs);
}
- if (mp_obj_is_subclass(lhs, rhs)) {
+ if (mp_obj_is_subclass_fast(lhs, rhs)) {
return mp_const_true;
} else {
return mp_const_false;