code: public Set<Map.Entry<BinaryValue, BinaryValue>> getUserMetadata()
      {
          return Collections.unmodifiableSet(meta.entrySet());
      }
docs: Get the user metadata entries
  <p>
  This method allows access to the user metadata entries directly as raw bytes. The
  {@code Set} is an unmodifiable view of all the entries.
  <p>
  
  @return an unmodifiable view of all the entries.