chore: miscellaneous RNTuple improvements #4142

Job	Run time
pyodide-build	1m 49s
build (windows-latest, 3.8)	7m 5s
numpy1-build (windows-latest, 3.11)	3m 31s
build (windows-latest, 3.9)	7m 3s
vanilla-build (windows-latest, 3.13)	5m 56s
numpy1-build (ubuntu-latest, 3.11)	2m 33s
build (windows-latest, 3.10)	8m 50s
numpy1-build (macos-latest, 3.11)	1m 59s
vanilla-build (ubuntu-latest, 3.13)	3m 12s
build (windows-latest, 3.11)	7m 57s
vanilla-build (macos-latest, 3.13)	2m 21s
build (windows-latest, 3.12)	7m 58s
build (macos-latest, 3.8)	4m 23s
build (macos-latest, 3.9)	5m 19s
build (macos-latest, 3.10)	4m 8s
build (macos-latest, 3.11)	4m 10s
build (macos-latest, 3.12)	4m 7s
build (ubuntu-latest, 3.8)	5m 17s
build (ubuntu-latest, 3.9)	4m 22s
build (ubuntu-latest, 3.10)	4m 48s
build (ubuntu-latest, 3.11)	4m 17s
build (ubuntu-latest, 3.12)	4m 11s
pass	2s
	1h 45m 18s

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