code: public Encoder writeRaw(byte[] rawBytes, int off, int len) throws IOException {
      output.write(rawBytes, off, len);
      return this;
    }
docs: Writes raw bytes to the buffer without encoding.
  
  @param rawBytes The bytes to write.
  @param off Offset to start in the byte array.
  @param len Number of bytes to write starting from the offset.