And... sure. It works. But the whole approach makes me want to disavow it. The right "value" should be a simple list (or sub-hash? seems unnecessary) containing both values. But using a "two strings smacked together" key just seems wrong. I'm just not sure what would ACTUALLY be simpler (for values of 'simpler' approximating "easier for a programmer to understand.")
Well, an in-memory database would be nicest, if there is an easy way to query it. And to be fast, it would build two indexes, which would either be b-trees or... *drummroll* hash tables.
But I wouldn't introduce such a big dependency for a relatively trivial feature.
So in the end I think it boils down to two hashes, which is the most pragmatic solution in Perl space.
It works, it isn't very complicated, it's easy to udnerstand for the reader -- what more do you want? Unless memory becomes scarce, I'd stay with the current solution.
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