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Improvements to NanoVDB #4897

Job	Run time
linux:2025-clang19.1-abi:12-cxx:clang++-type:Release	4m 25s
linux:2024-clang17.2-abi:11-cxx:clang++-type:Release	4m 15s
linux:2024-clang17.2-abi:11-cxx:g++-type:Release	3m 55s
macos-14	38m 5s
windows	50m 30s
macos-15	38m 33s
linux:2025-clang19.1-abi:12-cxx:clang++-type:Debug	17m 40s
linux:2025-clang19.1-abi:12-cxx:g++-type:Release	4m 36s
	2h 41m 59s

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