more cleanup and casting fixes. compiles! #1415

Job	Run time
check src/dotnet	6s
check if dotnet tests changed	6s
check src/bindings	8s
check build scripts and tools	8s
check if js tests changed	6s
check if py tests changed	7s
check workflow_ci	9s
build rhino3dm.js	20m 27s
build python sdist	3m 15s
build dotnet	0s
build python 3.10 linux ubuntu-latest bdist	1m 19s
build python 3.11 linux ubuntu-latest bdist	1m 11s
build python 3.12 linux ubuntu-latest bdist	1m 7s
build python 3.10 windows windows-2019 bdist	8m 10s
build python 3.11 windows windows-2019 bdist	9m 11s
build python 3.12 windows windows-2019 bdist	9m 3s
build python 3.10 macos macos-12 bdist	2m 3s
build python 3.11 macos macos-12 bdist	1m 58s
build python 3.12 macos macos-12 bdist	2m 32s
build python 3.10 macos macos-14 bdist	1m 45s
build python 3.11 macos macos-14 bdist	1m 41s
build python 3.12 macos macos-14 bdist	1m 34s
test dotnet	0s
build python ${{ matrix.python-version }} ${{ matrix.target }} ${{ matrix.os }} bdist	0s
test javascript	20s
	1h 6m 26s

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