what is that "under.mark(100);" in SandStormConfig ??

Hi,
I'm trying to fix some things in sandstorm config, particularly the include directive.
(I want to allow clobering and layering of config files under certain circumstances).
But what is that mark at "100"??!!!! It makes no sense!

Thanks.

SandStormConfig$directiveReader.read(), around line 910:


	if (!inComment && (c == '<')) {
	  under.mark(100);
	  if (under.read() == '!') {
	    // Process special directive; read until '>'

            [........ more code ...............]

	  } else {
	    // Got a '<' with no following '!'
	    under.reset();
	    return c;
	  }
	} else {
	  // Got something other than '<'
	  return c; 
	}


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