code: func NewMVMap() *MVMap {
  	m := new(MVMap)
  	m.hashTable = make(map[uint64]entryAddr)
  	m.entryStore.slices = [][]entry{make([]entry, 0, 64)}
  	// Append the first empty entry, so the zero entryAddr can represent null.
  	m.entryStore.put(entry{})
  	m.dataStore.slices = [][]byte{make([]byte, 0, 1024)}
  	return m
  }
docs: // NewMVMap creates a new multi-value map.