Serialization Refactor #18453

Job	Run time
test (1.6, short, Linux)	6m 49s
extra-long-test	0s
doctest (1.10, Linux, RPTU, normal-memory)	19m 55s
test (1.6, long, Linux)	7m 14s
doctest (1.11, Linux, RPTU, normal-memory)	22m 17s
test (1.10, short, Linux)	9m 30s
doctest (nightly, Linux, RPTU, normal-memory)	20m 35s
test (1.10, long, Linux)	17m 19s
test (1.11, short, Linux)	4m 25s
test (1.11, long, Linux)	13m 8s
doctest (1.10, Linux, RPTU, normal-memory, depwarn=error)	20m 37s
test (nightly, short, Linux)	2h 30m 16s
doctest (1.10, macOS, RPTU)	12m 31s
test (nightly, long, Linux)	17m 58s
test (1.10, short, Linux, RPTU, high-memory, depwarn=error)	9m 11s
test (1.10, long, Linux, RPTU, normal-memory, depwarn=error)	17m 18s
test (1.10, short, macOS, RPTU)	6m 25s
test (1.10, long, macOS, RPTU)	6m 38s
test (1.10, book, Linux, RPTU, normal-memory)	36m 24s
test (nightly, book, Linux, RPTU, normal-memory)	40m 19s
	7h 18m 49s

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