Mesh modifier changes now stick. #822

Job	Run time
check src/bindings	16s
check src/dotnet	12s
check build scripts and tools	14s
check workflow_ci	16s
build python sdist	14m 17s
build rhino3dm.js	4m 54s
build dotnet	0s
build python 3.9 linux bdist	17m 15s
build python 3.10 linux bdist	12m 49s
build python 3.9 windows bdist	12m 14s
build python 3.10 windows bdist	11m 26s
build python 3.9 macos bdist	20m 51s
build python 3.10 macos bdist	23m 50s
	1h 58m 34s

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