more functionality for collector objects #16922

Job	Run time
doctest (1.10, ubuntu-latest)	27m 6s
doctest (1.11-nightly, ubuntu-latest)	26m 24s
test (1.6, short, ubuntu-latest)	1h 48m 35s
doctest (nightly, ubuntu-latest)	37m 41s
test (1.6, long, ubuntu-latest)	55m 9s
doctest (1.10, ubuntu-latest, depwarn=error)	26m 24s
test (1.10, short, ubuntu-latest)	1h 11m 0s
doctest (1.10, macOS, RPTU)	12m 12s
test (1.10, long, ubuntu-latest)	44m 3s
test (1.11-nightly, short, ubuntu-latest)	7m 27s
test (1.11-nightly, long, ubuntu-latest)	53m 45s
test (nightly, short, ubuntu-latest)	1h 41m 11s
test (nightly, long, ubuntu-latest)	29m 55s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 11m 48s
test (1.10, long, ubuntu-latest, depwarn=error)	43m 28s
test (1.10, short, macOS, RPTU)	7m 23s
test (1.10, long, macOS, RPTU)	13m 50s
test (1.10, book, ubuntu-latest)	53m 24s
test (nightly, book, ubuntu-latest)	1h 9m 29s
	14h 20m 14s

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