pos(type, args)
  i = 0
  position: unquote(type)
  for j in (1..4)
    if length(args) > i
      {args[i]}: args[i + 1] is a 'unit' ? args[i += 1] : 0
    i += 1

absolute()
  pos('absolute', arguments)

relative()
  pos('relative', arguments)

fixed()
  pos('fixed', arguments)