Eliminate reliance on `ctor` #2802

Job	Run time
check-up-to-dateness	5s
test (macos-latest, crates-index)	17m 45s
test (macos-latest, tame-index)	16m 54s
test (ubuntu-latest, tame-index)	31m 18s
test (windows-latest, crates-index)	22m 0s
test (windows-latest, tame-index)	23m 12s
test (ubuntu-latest, crates-index)	28m 34s
all-checks	3s
	2h 19m 51s

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