message: round returns number
diff: @@ -90,7 +90,7 @@ namespace MakerJs {
  * @param accuracy Optional exemplar of number of decimal places.
  * @returns Rounded number.
  */
  - export function round(n: number, accuracy = .0000001) {
  + export function round(n: number, accuracy = .0000001): number {
  var exp = 1 - String(1 / accuracy).length;
  //Adapted from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/round
  