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refactor(session): stop excerpting the same tail turn twice in turnCost #3793

Job	Run time
static-analysis	48s
build	9s
test (2/4)	52s
test (3/4)	36s
test (4/4)	31s
test (1/4)	38s
test (one-process pollution detector)	0s
typecheck	2s
eslint	2s
prettier	3s
build-and-test	2s
test (src)	2s
	3m 45s