Questions about classloader design?

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I read the classloader source code and the design doc, but I still have some questions.

1. In my opinion, one class loader corresponds to one path and has a reference count, so the path should only be loaded only once. Why isLibraryLoaded to determine "are_meta_objs_bound_to_loader" is true ?

2. "Load_ref_count_" seems meaningless, "class_loader::impl::loadLibrary" will check the library is load, and will not load library twice.