Test

`parallelize` sets numba cores to 1 #1593

Job	Run time
test (3.12, ubuntu-latest)	9m 26s
test (3.12, macos-latest, --pre, Python 3.12 (pre-release))	13m 29s
test (3.11, ubuntu-latest)	8m 28s
test (3.10, ubuntu-latest)	8m 50s
	40m 13s

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