a bit faster set #779

Job	Run time
lib-site-build	1m 28s
benchmark-build	59s
yjs-lib-test	51s
lib-test (tsc - mobx6)	1m 8s
lib-test (tsc - mobx5)	1m 16s
lib-test (tsc - mobx4)	1m 12s
lib-test (tsc-experimental-decorators - mobx6)	1m 5s
lib-test (tsc-experimental-decorators - mobx5)	1m 4s
lib-test (tsc-experimental-decorators - mobx4)	1m 4s
lib-test (babel - mobx6)	53s
lib-test (babel - mobx5)	56s
lib-test (babel - mobx4)	55s
lib-test (swc - mobx6)	54s
lib-test (swc - mobx5)	52s
lib-test (swc - mobx4)	58s
	15m 35s

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