Allow square-brackets access to dataset objects #805

Job	Run time
style	11s
Coverage tests (ubuntu-latest / Python 3.11)	10m 58s
build (ubuntu-latest, 3.8)	6m 3s
build (ubuntu-latest, 3.9)	6m 1s
build (ubuntu-latest, 3.10)	5m 54s
build (ubuntu-latest, 3.11)	5m 46s
build (windows-latest, 3.8)	7m 24s
build (windows-latest, 3.9)	7m 33s
build (windows-latest, 3.10)	8m 2s
build (windows-latest, 3.11)	8m 9s
build (macos-latest, 3.8)	11m 19s
build (macos-latest, 3.9)	13m 36s
build (macos-latest, 3.10)	14m 46s
build (macos-latest, 3.11)	13m 15s
	1h 58m 57s

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