@Override
    public void clear() {
        if (size == 0) {
            return;
        }
        for (int i = 0, length = values.length; i < length; i++) {
            values[i] = null;
        }
        size = 0;
    }
@author James Chen
@see java.util.EnumMap
turms-server-common/src/main/java/im/turms/server/common/infra/collection/FastEnumMap.java