xxhash_unsafe.go
func ChecksumString32S(s string, seed uint32) uint32 {
	if len(s) == 0 {
		return Checksum32S(nil, seed)
	}
	ss := (*reflect.StringHeader)(unsafe.Pointer(&s))
	return Checksum32S((*[maxInt32]byte)(unsafe.Pointer(ss.Data))[:len(s):len(s)], seed)
}
func ChecksumString32S(s string, seed uint32) uint32 {
	if len(s) == 0 {
		return Checksum32S(nil, seed)
	}
	ss := (*reflect.StringHeader)(unsafe.Pointer(&s))
	return Checksum32S((*[maxInt32]byte)(unsafe.Pointer(ss.Data))[:len(s):len(s)], seed)
}
// ChecksumString32S returns the checksum of the input data, without creating a copy, with the specific seed.