more functionality for collector objects #16886

Job	Run time
doctest (1.10, ubuntu-latest)	25m 34s
doctest (1.11-nightly, ubuntu-latest)	25m 37s
doctest (nightly, ubuntu-latest)	24m 27s
doctest (1.10, ubuntu-latest, depwarn=error)	25m 50s
test (1.6, short, ubuntu-latest)	17m 18s
doctest (1.10, macOS, RPTU)	12m 35s
test (1.6, long, ubuntu-latest)	53m 49s
test (1.10, short, ubuntu-latest)	1h 11m 30s
test (1.10, long, ubuntu-latest)	43m 55s
test (1.11-nightly, short, ubuntu-latest)	1h 26m 0s
test (1.11-nightly, long, ubuntu-latest)	51m 54s
test (nightly, short, ubuntu-latest)	1h 23m 40s
test (nightly, long, ubuntu-latest)	52m 12s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 11m 29s
test (1.10, long, ubuntu-latest, depwarn=error)	42m 55s
test (1.10, short, macOS, RPTU)	14m 0s
test (1.10, long, macOS, RPTU)	14m 1s
test (1.10, book, ubuntu-latest)	55m 52s
test (nightly, book, ubuntu-latest)	1h 4m 11s
	13h 56m 49s

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