pennae dc895fb281 lib: make extendDerivation lighter on eval ... the fix to extendDerivation in #140051 unwittingly worsened eval performance by quite a bit. set elements alone needed over 1GB extra after the change, which seems disproportionate to how small it was. if we flip the logic used to determine which outputs to install around and keep a "this one exactly" flag in the specific outputs instead of a "all of them" in the root we can avoid most of that cost.		2021-10-15 16:39:10 +02:00
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