public V remove(K key) {
        int ordinal = key.ordinal();
        V value = values[ordinal];
        if (value != null) {
            size--;
            values[ordinal] = null;
        }
        return value;
    }
@author James Chen
@see java.util.EnumMap
turms-server-common/src/main/java/im/turms/server/common/infra/collection/FastEnumMap.java