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Enable JS wrapper objects to be used as transferable or cloneable objects in `postMessage()` calls, by having them extend a C++-backed class. This requires a few internal changes: - This commit adds the possibility for transferred objects to read/write JS values at the end of the serialization/deserialization phases. - This commit adds the possibility for transferred objects to list sub-transferables, e.g. typically the public JS wrapper class would list its C++ handle in there. - This commit adds usage of `BaseObject` in a few more places, because now during deserialization weakly held objects can also be involved, in addition to `MessagePort`s. PR-URL: https://github.com/nodejs/node/pull/33772 Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>