Use concrete types when possible for improved performance #815

Job	Run time
pr_build / macOS Universal (Debug)	4m 49s
pr_build / win-x64 (Debug)	7m 51s
pr_build / macOS Universal (Release)	4m 10s
pr_build / linux-x64 (Debug)	4m 33s
pr_build / linux-arm64 (Debug)	2m 47s
pr_build / osx-x64 (Debug)	4m 10s
pr_build / win-x64 (Release)	7m 36s
pr_build / linux-x64 (Release)	4m 5s
pr_build / linux-arm64 (Release)	2m 38s
pr_build / osx-x64 (Release)	3m 49s
	46m 28s

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