More bib cleanup (#4118) #6

Job	Run time
doctest (1.10, ubuntu-latest)	35m 17s
doctest (1.11-nightly, ubuntu-latest)	31m 13s
test (1.6, short, ubuntu-latest)	1h 33m 23s
test (1.6, long, ubuntu-latest)	59m 55s
doctest (nightly, ubuntu-latest)	30m 12s
doctest (1.10, ubuntu-latest, depwarn=error)	34m 7s
test (1.10, short, ubuntu-latest)	1h 13m 44s
doctest (1.10, macOS, RPTU)	0s
test (1.10, long, ubuntu-latest)	49m 32s
test (1.11-nightly, short, ubuntu-latest)	1h 28m 32s
test (1.11-nightly, long, ubuntu-latest)	52m 54s
test (nightly, short, ubuntu-latest)	1h 17m 34s
test (nightly, long, ubuntu-latest)	54m 33s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 13m 11s
test (1.10, long, ubuntu-latest, depwarn=error)	48m 23s
test (1.10, short, macOS, RPTU)	0s
test (1.10, long, macOS, RPTU)	0s
test (1.10, book, ubuntu-latest)	53m 6s
	14h 15m 36s

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