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refactor(tools): share arg guards, bounded reads, and process spawn #3912

Job	Run time
static-analysis	51s
test (4/4)	49s
test (2/4)	57s
test (1/4)	33s
build	13s
test (3/4)	39s
test (one-process pollution detector)	0s
typecheck	4s
prettier	2s
eslint	4s
test (src)	3s
build-and-test	3s
	4m 18s