Test

Remove support for assigning `None` to a `SplitField` #36

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Run time

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Job	Run time
build (3.8)	1m 40s
build (3.9)	1m 22s
build (3.10)	1m 57s
build (3.11)	1m 46s
build (3.12-dev)	1m 53s
	8m 38s