Implement PEP 639 #6192

Job	Run time
test (3.9, ubuntu-latest)	4m 12s
collateral (diffcov)	4m 50s
test_cygwin (39, windows-latest)	19m 32s
test (3.9, macos-latest)	4m 57s
collateral (docs)	2m 8s
test (3.9, windows-latest)	12m 10s
test (3.13, ubuntu-latest)	4m 51s
test (3.13, macos-latest)	4m 33s
test (3.13, windows-latest)	9m 1s
test (3.10, ubuntu-latest)	4m 15s
test (3.11, ubuntu-latest)	4m 18s
test (3.12, ubuntu-latest)	5m 32s
test (3.14, ubuntu-latest)	8m 31s
test (pypy3.10, ubuntu-latest, stdlib)	16m 31s
test (ubuntu-latest, 3.10, stdlib)	4m 36s
integration-test	0s
check	3s
release	0s
	1h 50m 0s

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