Slightly improve performance of `mutate` #280

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Run time

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Job	Run time
hal-cgp testsuite (3.7, [all])	4m 57s
hal-cgp testsuite (3.8, [all])	7m 19s
hal-cgp testsuite (3.9, [all])	6m 29s
hal-cgp testsuite (3.9, [dev])	1m 18s
	20m 3s