fix: bind_constructor 宏补 length 描述符 meta

crates/oxide_vm/src/bindings/bind_date.rs

@@ -2,7 +2,7 @@ use std::sync::Arc;
 
 use crate::bindings::{apply_binding_table, bind_global_value, configure_native_constructor};
 use oxide_kernel::kernel::{KernelCore, KernelSession};
-use oxide_types::object::JsObject;
+use oxide_types::object::{JsObject, PropAttributes};
 use oxide_types::value::JsValue;
 
 /// 把 Date 构造器与原型方法绑定到 global。
@@ -13,6 +13,13 @@ pub fn bind_date(core: &Arc<KernelCore>, session: &KernelSession, global: &mut J
     let proto = unsafe { &mut *proto_ptr };
 
     configure_native_constructor(ctor, oxide_builtins::date::date_constructor::<crate::vm::Vm> as *const (), 7);
+    // Date.length = 7，描述符 { writable:false, enumerable:false, configurable:true }。
+    let length_si = core.perm_interner().intern("length").0;
+    let length_shape = core.shape_forge().make_shape(ctor.shape_id(), length_si);
+    ctor.set_shape_id(length_shape);
+    ctor.ensure_hash_props().push(JsValue::int(7));
+    let length_pos = ctor.hash_props_vec().map_or(0, |v| v.len() as u32).saturating_sub(1);
+    ctor.set_data_meta(length_pos, PropAttributes::new(false, false, true));
 
     apply_binding_table(
         session.builtin_world(),