@Override
    public int hashCode() {
        if (hashcode < 0) {
            hashcode = hashCode(HASH_MULTIPLIER, bytes, byteOffset, byteCount);
        }
        return hashcode;
    }
@see java.nio.charset.CharsetEncoder#maxBytesPerChar()
turms-server-common/src/main/java/im/turms/server/common/infra/lang/Utf8String.java