code: function range(from, to) {
    // TODO: make this inlined.
    const list = new Array(to - from + 1);
  
    for (let i = 0; i < list.length; i += 1) {
      list[i] = from + i;
    }
    return list;
  }
docs: Create an array of numbers.
  @param {number} from
  @param {number} to
  @returns {number[]}