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Added package and using single class imports. #1955

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Run time

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Job	Run time
tests (windows, stable)	12m 58s
tests (macos, stable)	13m 56s
tests (macos, nightly)	10m 50s
tests (ubuntu, nightly)	8m 41s
tests (windows, nightly)	48s
tests (ubuntu, stable)	8m 45s
	55m 58s