mp_obj_equal(): Compare small and long ints properly.

By dispatching to long int methods.

py/obj.c

@@ -108,9 +108,15 @@ bool mp_obj_equal(mp_obj_t o1, mp_obj_t o2) {
                 return val == 0;
             } else if (o2 == mp_const_true) {
                 return val == 1;
-            } else {
-                return false;
+            } else if (MP_OBJ_IS_TYPE(o2, &int_type)) {
+                // If o2 is long int, dispatch to its virtual methods
+                mp_obj_base_t *o = o2;
+                if (o->type->binary_op != NULL) {
+                    mp_obj_t r = o->type->binary_op(RT_COMPARE_OP_EQUAL, o2, o1);
+                    return r == mp_const_true ? true : false;
+                }
             }
+            return false;
         }
     } else if (MP_OBJ_IS_QSTR(o1) || MP_OBJ_IS_QSTR(o2)) {
         return false;