in src/lib/vpsc.js [163:171]
Block.prototype.findMinLMBetween = function (lv, rv) {
this.compute_lm(lv, null, function () { });
var m = null;
this.findPath(lv, null, rv, function (c, next) {
if (!c.equality && c.right === next && (m === null || c.lm < m.lm))
m = c;
});
return m;
};