Merge branch 'optionalConversionTraits' into combined2 #96

Job	Run time
AMD64 Ubuntu 24.04 R 4.4 Force-Tests true	1s
rhub/ubuntu-gcc12:latest	1s
AMD64 Windows C++ RTools 40 ucrt64	1s
Check minimum supported Arrow C++ Version (19.0.1)	10s
AMD64 Windows R ${{ matrix.config.rversion }}	1s
	14s

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