Trivial cleanups (#4130) #16624

Job	Run time
doctest (1.10, ubuntu-latest)	24m 49s
doctest (1.11-nightly, ubuntu-latest)	24m 33s
doctest (nightly, ubuntu-latest)	25m 36s
doctest (1.10, ubuntu-latest, depwarn=error)	24m 59s
doctest (1.10, macOS, RPTU)	12m 9s
test (1.6, short, ubuntu-latest)	1h 22m 50s
test (1.6, long, ubuntu-latest)	55m 8s
test (1.10, short, ubuntu-latest)	1h 9m 35s
test (1.10, long, ubuntu-latest)	47m 41s
test (1.11-nightly, short, ubuntu-latest)	1h 21m 25s
test (1.11-nightly, long, ubuntu-latest)	52m 34s
test (nightly, short, ubuntu-latest)	1h 21m 33s
test (nightly, long, ubuntu-latest)	52m 50s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 9m 40s
test (1.10, long, ubuntu-latest, depwarn=error)	45m 48s
test (1.10, short, macOS, RPTU)	13m 36s
test (1.10, long, macOS, RPTU)	14m 2s
test (1.10, book, ubuntu-latest)	50m 47s
	13h 49m 35s

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