Function thresholdValues

docs/tests/v2/es6/js/sanddance.js:110424–110428

(thresholds)

}

function thresholdValues(thresholds) {
  const values = [-Infinity].concat(thresholds);
  values.max = +Infinity;
  return values;
}

function binValues(bins) {
  const values = bins.slice(0, -1);