function argument sorter

[Schokokex]

function argSorter(o,order,must) -- o: toSort args, order: {"function","string",..}, must:{true,false...}
 local out = {}
 for i,v in ipairs(order) do
  for _,v in pairs(o) do
   if order[i]==type(v) then out[i] = v break end
  end
  if nil==out[i] and must[i] then error(string.format("required %s not found",order[i]),3) end
 end
 return out[1],out[2],out[3] -- unpack fails if out[1]==nil
end