! model         = keycodes
  *             = default_keycodes

! layout[1]     = symbols
  *             = x:all // force x on all groups

! layout[later] = symbols
  // skipped, as it has no explicit merge mode and
  // thus is not appended to previous
  *             = skip

! model         = types
  *             = default_types

! model         = compat
  *             = default_compat

! option        = symbols