function errorTransform (err) {
  if (err && err.isIndexError) {
    return new IndexError(
      err.index + 1,
      err.min + 1,
      err.max !== undefined ? err.max + 1 : undefined)
  }

  return err
}
Transform zero-based indices to one-based indices in errors
@param {Error} err
@returns {Error | IndexError} Returns the transformed error