`ConstantKernel` #518

Job	Run time
run_unit_tests (master, with-extras)	1m 48s
run_examples	7m 14s
run_linter	29s
run_unit_tests (master, no-extras)	1m 44s
run_unit_tests (stable, with-extras)	1m 48s
run_unit_tests (stable, no-extras)	1m 29s
	14m 32s

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