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> Using metatables, I'd imagine this would be easy to implement. The __newindex method is provided to catch new entries to the table, which is
> where you count new entries. I'd go a step further and memoize a function that returned these counts, and use the table itself as a key in the
> memoization.
I think you'd run into the problem that there isn't any metamethod called when a table entry is set to nil (aka deleted)?