regnat
4d45839499
PRs #4370 and #4348 had a bad interaction in that the second broke the fist one in a not trivial way. The issue was that since #4348 the logic for detecting whether a derivation output is already built requires some logic that was specific to the `LocalStore`. It happens though that most of this logic could be upstreamed to any `Store`, which is what this commit does.
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