Consolidate as part of TraceFrontier `map_times` #292

Job	Run time
test mdBook	41s
cargo test on ubuntu, rust stable	55s
cargo test on ubuntu, rust 1.72	1m 1s
cargo test on macos, rust stable	52s
cargo test on macos, rust 1.72	57s
cargo test on windows, rust stable	2m 39s
cargo test on windows, rust 1.72	2m 3s
	9m 8s

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