@Override
    public V remove(byte key) {
        int index = indexOf(key);
        if (index == -1) {
            return null;
        }

        V prev = values[index];
        removeAt(index);
        return toExternal(prev);
    }
The load factor for the map. Used to calculate {@link #maxSize}.
jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/util/ByteObjectHashMap.java