Github user synhershko commented on the issue:
https://github.com/apache/lucenenet/pull/185
At some point I looked at WeakDictionary as a replacement but didn't go
forward with it because of some behavior mismatch. Can't really remember now
exactly what it was. If you are certain that's the way to go I'm okay with it,
otherwise let's keep a close eye on the beavior of that code...
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