message: Improve arraySeed utility
  This is a tiny microimprovement, but worthwhile the more we use it.
diff: @@ -112,11 +112,9 @@ export function arrayRescale(input: number[], newMin: number, newMax: number): n
  * @returns {T[]} The array.
  */
  export function arraySeed<T>(val: T, length: number): T[] {
  - const a: T[] = [];
  - for (let i = 0; i < length; i++) {
  - a.push(val);
  - }
  - return a;
  + // Size the array up front for performance, and use `fill` to let the browser
  + // optimize the operation better than we can with a `for` loop, if it wants.
  + return new Array<T>(length).fill(val);
  }
  /**
  