Clamp smi in fast calls by default #3434

Job	Run time
compute-jobs	4s
build-linux / linux lint	55s
build-linux / linux test	3m 56s
build-linux / linux lint-deps	1m 46s
build-linux / linux coverage	4m 12s
build-linux / linux test-miri	6m 40s
build-linux / linux test-ops	6m 13s
build-linux / linux test-publish	1m 30s
build-linux-arm / linux-arm test	5m 57s
build-linux-arm / linux-arm test-miri	10m 48s
build-linux-arm / linux-arm lint	1m 42s
build-linux-xl / linux-xl test-valgrind	21m 58s
build-macos / macos lint	1m 23s
build-macos / macos test	3m 35s
build-windows / windows lint	4m 31s
build-windows / windows test	9m 12s
success	1s
	1h 24m 23s

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