Test

Persist color channels in `rasterize()` #779

Job	Run time
test (3.9, ubuntu-latest)	6m 14s
test (3.10, ubuntu-latest)	8m 17s
test (macos-latest, 3.9)	3m 2s
test (macos-latest, 3.10, --pre, Python 3.10 (pre-release))	2m 46s
	20m 19s

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