vendors/tempy.js/fill
    var fill = (start, end, step, options = {}) => {
      if (end == null && isValidValue(start)) {
        return [start];
      }
      if (!isValidValue(start) || !isValidValue(end)) {
        return invalidRange(start, end, options);
      }
      if (typeof step === "function") {
        return fill(start, end, 1, { transform: step });
      }
      if (isObject(step)) {
        return fill(start, end, 0, step);
      }
      let opts = __spreadValues({}, options);
      if (opts.capture === true)
        opts.wrap = true;
      step = step || opts.step || 1;
      if (!isNumber(step)) {
        if (step != null && !isObject(step))
          return invalidStep(step, opts);
        return fill(start, end, 1, step);
      }
      if (isNumber(start) && isNumber(end)) {
        return fillNumbers(start, end, step, opts);
      }
      return fillLetters(start, end, Math.max(Math.abs(step), 1), opts);
    };