`tree_flatten` supports named tuples #4928

Job	Run time
precommit-run / pre-commit	37s
check-package / init-store	6s
check-schema / schema	12s
check-package / pkg-build (ubuntu-latest)	22s
check-package / pkg-check (ubuntu-latest, 3.10)	3m 3s
check-package / pkg-check (ubuntu-latest, 3.11)	2m 57s
check-package / pkg-check (macOS-latest, 3.10)	1m 32s
check-package / pkg-check (macOS-latest, 3.11)	1m 9s
check-package / pkg-check (windows-latest, 3.10)	2m 54s
check-package / pkg-check (windows-latest, 3.11)	3m 9s
check-package / pkg-guardian	1s
	16m 2s

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