Replace use of _id2ref in DRb.#2102
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This implementation must periodically "clean" stale references out of the underlying Hash, which requires an O(n) search. To reduce the chance of this search happening, it only runs when inserting a new entry into the weak mapping. Stale entries that are discovered while retrieving entries are deleted individually.
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This implementation uses the
weakreflibrary to implement a simple weak mapping atop a normal Hash. Access to that Hash is guarded by a Mutex.This is the initial proposed implementation for https://bugs.ruby-lang.org/issues/15711