Function signed

bench/diff.js:167–170

(n, digits = 3)

function pct(n) { return `${(n * 100).toFixed(1)}%`; }
function ms(n) { return `${(n / 1000).toFixed(1)}s`; }
function signed(n, digits = 3) {
  const s = n.toFixed(digits);
  return n >= 0 ? `+${s}` : s;
}

function render(baseSum, featSum, moves, v, threshold, basePath, featPath) {
  const deltaReward = featSum.reward - baseSum.reward;