Add note about implementing inplace operators.
diff --git a/py/runtime.c b/py/runtime.c
index a8e5546..3144321 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -471,6 +471,16 @@
mp_obj_t rt_binary_op(int op, mp_obj_t lhs, mp_obj_t rhs) {
DEBUG_OP_printf("binary %d %p %p\n", op, lhs, rhs);
+
+ // TODO correctly distinguish inplace operators for mutable objects
+ // lookup logic that CPython uses for +=:
+ // check for implemented +=
+ // then check for implemented +
+ // then check for implemented seq.inplace_concat
+ // then check for implemented seq.concat
+ // then fail
+ // note that list does not implement + or +=, so that inplace_concat is reached first for +=
+
if (MP_OBJ_IS_SMALL_INT(lhs) && MP_OBJ_IS_SMALL_INT(rhs)) {
mp_small_int_t lhs_val = MP_OBJ_SMALL_INT_VALUE(lhs);
mp_small_int_t rhs_val = MP_OBJ_SMALL_INT_VALUE(rhs);