more functionality for dict serialization #13927

Job	Run time
doctest (1.9, ubuntu-latest)	26m 47s
doctest (1.10, ubuntu-latest)	31m 30s
doctest (1.11-nightly, ubuntu-latest)	28m 6s
doctest (nightly, ubuntu-latest)	28m 34s
doctest (1.10, ubuntu-latest, depwarn=error)	30m 41s
doctest (1.10, macOS-14)	17m 35s
test (1.6, short, ubuntu-latest)	1h 1m 57s
test (1.6, long, ubuntu-latest)	47m 57s
test (1.9, short, ubuntu-latest)	58m 7s
test (1.9, long, ubuntu-latest)	44m 1s
test (1.10, short, ubuntu-latest)	46m 52s
test (1.10, long, ubuntu-latest)	42m 9s
test (1.11-nightly, short, ubuntu-latest)	59m 57s
test (1.11-nightly, long, ubuntu-latest)	54m 31s
test (nightly, short, ubuntu-latest)	1h 1m 9s
test (nightly, long, ubuntu-latest)	53m 42s
test (1.10, short, ubuntu-latest, depwarn=error)	45m 57s
test (1.10, long, ubuntu-latest, depwarn=error)	42m 49s
test (1.10, short, macOS-14)	45m 43s
test (1.10, long, macOS-latest)	54m 12s
	14h 42m 16s

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