fuzzy/apply_src.go
func newApplySource(seed string) *applySource {
	h := fnv.New32()
	h.Write([]byte(seed))
	s := &applySource{seed: int64(h.Sum32())}
	s.reset()
	return s
}
func newApplySource(seed string) *applySource {
	h := fnv.New32()
	h.Write([]byte(seed))
	s := &applySource{seed: int64(h.Sum32())}
	s.reset()
	return s
}
// newApplySource will create a new source, any source created with the same seed will generate the same sequence of data.