LGTM
https://codereview.appspot.com/561390043/diff/563450046/lily/score-engraver.cc File lily/score-engraver.cc (right): https://codereview.appspot.com/561390043/diff/563450046/lily/score-engraver.cc#newcode200 lily/score-engraver.cc:200: // This double the heap. TODO: don't do this if we get close to s/double/doubles/ https://codereview.appspot.com/561390043/