unpack in lua5.1

[al_lea <abrash_han@...>]

hi,

I'd just port some code from lua5.0 to 5.1 and found that unpack(arg) doesn't
work as expected.

code sample:
g_load_new =
{
  [1] = "arcaves.lua",
  [4] = 1,
  n = 4,
 }
 
function foo(...)
 print(unpack(arg))
 print(arg.n)
end

foo(unpack(g_load_new))
-- end --
in 5.0 the output is:
arcaves.lua nil nil 1
4

in 5.1 the output is:
arcaves.lua
1

Is there some way to make the unpack works well with nil holes? like this (PiL,
chap 5.2):
"Sometimes, a function with a variable number of arguments needs to pass them
all to another function. All it has to do is to call the other function using
unpack(arg) as argument: unpack will return all values in arg, which will be
passed to the other function. "

Thanks,
hZ