Eliminate reliance on `ctor` #2804

Job	Run time
check-up-to-dateness	4s
test (macos-latest, crates-index)	14m 1s
test (ubuntu-latest, tame-index)	59m 35s
test (macos-latest, tame-index)	11m 39s
test (ubuntu-latest, crates-index)	55m 46s
test (windows-latest, crates-index)	13m 0s
test (windows-latest, tame-index)	13m 3s
all-checks	3s
	2h 47m 11s

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