public boolean isSerializedValue(byte[] value) {
      ByteBuffer buf = ByteBuffer.wrap(value);
      return buf.capacity() == 3 && buf.get() == DSCODE.DS_FIXED_ID_SHORT.toByte()
          && buf.getShort() == getDSFID();
    }
Singleton token indicating an Invalid Entry.
geode-core/src/main/java/org/apache/geode/internal/cache/Token.java