> go test -bench=. -benchmem .
goos: darwin
goarch: arm64
pkg: s2
BenchmarkContains-10 292790610 4.109 ns/op 0 B/op 0 allocs/op
BenchmarkContainsForLoop-10 244389747 4.917 ns/op 0 B/op 0 allocs/op
BenchmarkContainsMapStrings-10 31198578 38.23 ns/op 0 B/op 0 allocs/op
BenchmarkContainsSearchStrings-10 172281662 6.958 ns/op 0 B/op 0 allocs/op
BenchmarkSliceContains-10 292648843 4.092 ns/op 0 B/op 0 allocs/op
PASS
ok s2 8.164s