该 BoundProperty 在绑定属性内部列表中的索引。
当域重新加载发生或与 BoundProperty 关联的 GameObject 或组件被销毁时，绑定属性索引会被回收。当索引被回收时，系统会递增版本标识符。要表示相同的 BoundProperty，索引和版本必须匹配。如果索引和版本不同，则索引已被回收。
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