Is it possible to reduce the size of collapsed empty lists?

I would prefer it to take up the same horizontal space as ordinary entries, empty IEnumerables and also non-empty lists.

For example

var range = Enumerable.Range(1, 30).ToArray();
var EmptyIEnumerable = range.Where(r=>false);

var x1 = (from a in range select new { a, EmptyIEnumerable}) ;
var x2 = (from a in range select new { a, EmptyList = EmptyIEnumerable.ToList() }) ;

Util.HorizontalRun(true, x1, x2).Dump(1);   

displays as

I tried changing the font on the td.typeheader style, but it would have to be unreadably small to fit.