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* Replace some non-deterministic lazy folds with strict folds. * Replace some O(n log n) folds in deterministic order with O(n) non-deterministic folds. * Replace some folds with set-operations on the underlying IntMaps. This reduces max residency when compiling `nofib/spectral/simple/Main.hs` with -O0 by about 1%. Maximum residency when compiling Cabal also seems reduced on the order of 3-9%.
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