kubernetes/vendor/github.com/cespare/xxhash/v2/xxhash_unsafe.go

// Sum64String computes the 64-bit xxHash digest of s with a zero seed.
// It may be faster than Sum64([]byte(s)) by avoiding a copy.
func Sum64String(s string) uint64 { … }

// WriteString adds more data to d. It always returns len(s), nil.
// It may be faster than Write([]byte(s)) by avoiding a copy.
func (d *Digest) WriteString(s string) (n int, err error) { … }

type sliceHeader …