good first bughelp wanted
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説明
The cache maps C pointers (integers) to JS object wrappers. It
currently keeps objects alive forever. This is normally ok as the
objects should be manually destroy()ed, however, we do allow
wrapping a class as a parent class, and then it ends up in
multiple caches, see https://github.com/kripken/ammo.js/issues/284
Using WeakRefs where available could avoid this. However, until they are present everywhere, perhaps we could analyze the inheritance graph and clean up parent caches too, but that may be tricky especially with multiple/virtual/etc. inheritance.