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Cheers!

Carsonbot

Thanks for having another look :)
For 1. and 2., is it really better? To me, the main thing to optimize is the number of roundtrips to the backend. The changes here increase the number of roundtrips, so they should degrade perf to me.

P.1 and p.2 don't change the number of roundtrips, they just force the adapter to always work the same and not to rely on quasi-uniqueness of tag versions in some situations. P.3 may change the number of roundtrips but only downward by allowing large sets of tags (500+) to be cached for the very next reads (until other tags are requested). And although smaller sets are not affected much, I would suggest to use pruning instead of LRU cut-off. Pruning only expired tags would allow use of all known tags in any read operaion during their TTLs (as it was before).

Thank you @sbelyshkin.