As soon as all possible fields are in the pool, we're essentially readonly.
The problem is, there's no guarantee we will ever reach this point. For example suppose you have a server app that spawns a new thread per request. Each new thread might have to make all the .intern() calls again because they never see anything in the cache. Having said that, I agree that the code will still work correctly regardless, and this is a very unlikely scenario anyway - for most practical situations this is never going to be an issue.
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