Dimension of an ideal #17063

Job	Run time
doctest (1.10, ubuntu-latest)	26m 34s
doctest (1.11-nightly, ubuntu-latest)	26m 30s
test (1.6, short, ubuntu-latest)	1h 30m 36s
doctest (nightly, ubuntu-latest)	39m 42s
test (1.6, long, ubuntu-latest)	56m 37s
doctest (1.10, ubuntu-latest, depwarn=error)	28m 4s
doctest (1.10, macOS, RPTU)	13m 31s
test (1.10, short, ubuntu-latest)	1h 9m 7s
test (1.10, long, ubuntu-latest)	53m 9s
test (1.11-nightly, short, ubuntu-latest)	1h 23m 12s
test (1.11-nightly, long, ubuntu-latest)	52m 4s
test (nightly, short, ubuntu-latest)	1h 39m 16s
test (nightly, long, ubuntu-latest)	59m 36s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 6m 30s
test (1.10, long, ubuntu-latest, depwarn=error)	50m 14s
test (1.10, short, macOS, RPTU)	13m 52s
test (1.10, long, macOS, RPTU)	14m 39s
test (1.10, book, ubuntu-latest)	6m 35s
test (nightly, book, ubuntu-latest)	1h 7m 45s
	15h 17m 33s

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