code: func AddUint32(h, u uint32) uint32 {
  	h = (h ^ ((u >> 24) & 0xFF)) * prime32
  	h = (h ^ ((u >> 16) & 0xFF)) * prime32
  	h = (h ^ ((u >> 8) & 0xFF)) * prime32
  	h = (h ^ ((u >> 0) & 0xFF)) * prime32
  	return h
  }
docs: // AddUint32 adds the hash value of the 8 bytes of u to h.