function createPadding(length, chars) {
      chars = chars === undefined ? ' ' : baseToString(chars);

      var charsLength = chars.length;
      if (charsLength < 2) {
        return charsLength ? baseRepeat(chars, length) : chars;
      }
      var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
      return hasUnicode(chars)
        ? castSlice(stringToArray(result), 0, length).join('')
        : result.slice(0, length);
    }
Creates the padding for `string` based on `length`. The `chars` string
is truncated if the number of characters exceeds `length`.

@private
@param {number} length The padding length.
@param {string} [chars=' '] The string used as padding.
@returns {string} Returns the padding for `string`.