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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_4r2pho6s28vgtlhda4jhloc7eo, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
void readWrite(SomethingHead head);

default byte[] saveToByteArray aka saveAsByteArray aka toByteArray(head default new SomethingHead) {
  var baos = byteArrayOutputStream();
  head.outputStream(baos);
  readWrite(head);
  head.finish();
  ret baos.toByteArray();
}

default S toHexString() {
  ret main toHexString(toByteArray());
}

default File saveToFile(File file) {
  temp OutputStream out = bufferedFileOutputStream(file);
  var head = new SomethingHead(out);
  readWrite(head);
  head.finish();
  ret file;
}

default selfType load(byte[] data) {
  readWrite(new SomethingHead(new ByteArrayInputStream(data)));
  this;
}

default selfType load(File file) {
  temp InputStream in = bufferedInputStream(file);
  readWrite(new SomethingHead(in));
  this;
}