Add some #ifdef'd AtomicString counters for judging String efficiency I've been meaning to do this for some time. We should have an #ifdef mode where StringImpl constructors always do an AtomicString hash lookup to see if an atomic version of that impl already exists. We could then collect statistics and see how many duplicates of what strings are held in memory. Likewise, if we kept track, we could see what AtomicStrings are never (or rarely) used and possibly not load them into the AtomicString hash on startup. Finding unused atomic strings is likely not very interesting, since all the ones used in code are very very small. However, finding strings which really should be Atomic *is* very interesting.