Wed, 04 Jul 2018 22:44:24 +0200 wenzelm more frugal single-assignment according to David Matthews: dispose mutable lock/cond eventually;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 tip