Make UpstreamResolver re-use IPSet between Resolves
Tried implementing this idea again because of https://github.com/0xERR0R/blocky/discussions/557.
Do you think this is worth the extra complexity?
Do we need this after #589 is merged?
Not necessarily, but it's not exclusive either. I'm not sure how much of an improvement this would be as I don't have any way of making stats on requests (yet).
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This PR was closed because it has been stalled for 10 days with no activity.