`tree_flatten` supports named tuples #4920

Job	Run time
precommit-run / pre-commit	31s
check-package / init-store	4s
check-schema / schema	13s
check-package / pkg-build (ubuntu-latest)	17s
check-package / pkg-check (ubuntu-latest, 3.10)	2m 44s
check-package / pkg-check (ubuntu-latest, 3.11)	2m 57s
check-package / pkg-check (macOS-latest, 3.10)	58s
check-package / pkg-check (macOS-latest, 3.11)	1m 0s
check-package / pkg-check (windows-latest, 3.10)	3m 9s
check-package / pkg-check (windows-latest, 3.11)	3m 5s
check-package / pkg-guardian	1s
	14m 59s

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