It defines an ObjectData class to hold internal data related to each type.
它定义了objectdata类以存放与每个类型相关的内部数据。
The inUse field of ObjectData tracks objects given to the app, while the inPool field tracks how many actual references are in the pool.
ObjectData的inUse字段用于跟踪提供给应用程序的对象，而inPool 字段则用于跟踪池中有多少实际引用。
The inUse field of ObjectData tracks objects given to the app, while the inPool field tracks how many actual references are in the pool.
ObjectData的inUse字段用于跟踪提供给应用程序的对象，而inPool 字段则用于跟踪池中有多少实际引用。
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