Test

refactor: simplify internal chunk representation #6895

Job	Run time
Benchmark smoke test	8m 10s
py=3.14-upstream	11m 19s
doctests	1m 2s
py=3.12-min_deps	7m 32s
os=ubuntu-latest, py=3.13, deps=optional	7m 39s
os=windows-latest, py=3.12, deps=optional	10m 31s
os=ubuntu-latest, py=3.13, deps=minimal	6m 5s
os=ubuntu-latest, py=3.14, deps=minimal	5m 20s
os=ubuntu-latest, py=3.12, deps=minimal	5m 41s
os=ubuntu-latest, py=3.14, deps=optional	8m 5s
os=ubuntu-latest, py=3.12, deps=optional	6m 20s
os=macos-latest, py=3.12, deps=optional	6m 9s
os=windows-latest, py=3.14, deps=optional	9m 5s
os=macos-latest, py=3.14, deps=optional	4m 41s
Test complete	3s
	1h 37m 42s

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