signals: Rebuild stale global cache entries automatically #4809
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When rebuilding with
dx serve --hot-patch, changing the type of the value held in aGlobalSignalcurrently results in a panic, due to a downcast failure.This patch causes the runtime to evict the existing value with a warning when that happens, rather than panicking.
I considered making the type part of the key, but this feels gentler, since this is a rare occurrence.