fix: sloppy 模式属性赋值静默 no-op——写失败按写方严格模式分派，内置写路径一律按严格

crates/oxide_builtins/src/array.rs

@@ -619,7 +619,7 @@ fn array_from_set_length<H: VmHost>(vm: &mut H, a: *mut JsObject, is_array: bool
     let length_key = vm.new_string("length");
     let length_si = vm.property_key_si(length_key);
     let a_val = JsValue::from_js_object(a);
-    match vm.ordinary_set(a_obj, length_si, JsValue::int(len as i32), a_val) {
+    match vm.ordinary_set(a_obj, length_si, JsValue::int(len as i32), a_val, true) {
         Ok(()) => Ok(()),
         Err(err) => Err(from_engine_error(vm, &err)),
     }
@@ -731,7 +731,7 @@ pub fn array_slice<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
     let a_val = JsValue::from_js_object(a_ptr);
     let length_key = vm.new_string("length");
     let length_si = vm.property_key_si(length_key);
-    if let Err(err) = vm.ordinary_set(unsafe { &mut *a_ptr }, length_si, js_array_index(out_idx), a_val) {
+    if let Err(err) = vm.ordinary_set(unsafe { &mut *a_ptr }, length_si, js_array_index(out_idx), a_val, true) {
         return NativeResult::Err(from_engine_error(vm, &err));
     }
     NativeResult::Ok(JsValue::from_js_object(a_ptr))
@@ -1843,7 +1843,7 @@ pub fn array_iterator_next<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
             }
             _ => element,
         };
-        if let Err(msg) = vm.ordinary_set(iter, index_si, JsValue::int(index + 1), this_val) {
+        if let Err(msg) = vm.ordinary_set(iter, index_si, JsValue::int(index + 1), this_val, true) {
             return NativeResult::Err(crate::error::create_from_text(vm, &msg));
         }
         return NativeResult::Ok(crate::iterator::make_iter_result(vm, value, false));
@@ -1876,7 +1876,7 @@ pub fn array_iterator_next<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
         }
         _ => element,
     };
-    if let Err(msg) = vm.ordinary_set(iter, index_si, JsValue::int(index + 1), this_val) {
+    if let Err(msg) = vm.ordinary_set(iter, index_si, JsValue::int(index + 1), this_val, true) {
         return NativeResult::Err(crate::error::create_from_text(vm, &msg));
     }
     NativeResult::Ok(crate::iterator::make_iter_result(vm, value, false))

crates/oxide_builtins/src/iterator.rs

@@ -114,7 +114,7 @@ fn iterator_setter_ignore_proto_props<H: VmHost>(vm: &mut H, args: &[u8], key: u
             Err(err) => NativeResult::Err(crate::error::create_type_error(vm, &err)),
         }
     } else {
-        match vm.ordinary_set(this_obj, key, val, this_val) {
+        match vm.ordinary_set(this_obj, key, val, this_val, true) {
             Ok(()) => NativeResult::Ok(JsValue::undefined()),
             Err(err) => NativeResult::Err(crate::error::create_type_error(vm, &err)),
         }

crates/oxide_builtins/src/object.rs

@@ -496,7 +496,7 @@ pub fn object_assign<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
     for (si, val) in all_assignments {
         let promoted = vm.promote_if_needed_for_write_ptr(target_ptr, val);
         // Set(to, key, value, true)：receiver 为目标对象（目标同名 setter 的 this 指向 target）。
-        if let Err(err) = vm.ordinary_set(target, si, promoted, target_val) {
+        if let Err(err) = vm.ordinary_set(target, si, promoted, target_val, true) {
             return NativeResult::Err(crate::error::create_type_error(vm, &err));
         }
     }
@@ -1089,7 +1089,7 @@ pub fn object_from_entries<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
         // ToPropertyKey 语义建键：int/规范数字串/symbol 统一映射，避免数字键分裂。
         let si = vm.property_key_si(key_val);
         let promoted = vm.promote_if_needed_for_write_ptr(obj, value_val);
-        let _ = vm.ordinary_set(unsafe { &mut *obj }, si, promoted, target_val);
+        let _ = vm.ordinary_set(unsafe { &mut *obj }, si, promoted, target_val, true);
     }
     NativeResult::Ok(target_val)
 }
@@ -1483,7 +1483,7 @@ pub fn object_group_by<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
             let new_arr_val = JsValue::from_js_object(arr);
             let result_ref_mut = unsafe { &mut *result };
             let promoted = vm.promote_if_needed_for_write_ptr(result, new_arr_val);
-            let _ = vm.ordinary_set(result_ref_mut, key_si, promoted, result_val);
+            let _ = vm.ordinary_set(result_ref_mut, key_si, promoted, result_val, true);
             new_arr_val
         };
         // push element 到分组数组（写入前 promote，与 Array.prototype.push 同款）。

crates/oxide_builtins/src/reflect.rs

@@ -222,7 +222,7 @@ pub fn reflect_set<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
     if !target.is_extensible() && vm.get_own_property_slot(target, key_si).is_none() {
         return NativeResult::Ok(JsValue::bool(false));
     }
-    NativeResult::Ok(JsValue::bool(vm.ordinary_set(target, key_si, value, receiver).is_ok()))
+    NativeResult::Ok(JsValue::bool(vm.ordinary_set(target, key_si, value, receiver, true).is_ok()))
 }
 
 /// `Reflect.setPrototypeOf(target, proto)`：设置 prototype（对象或 null）。