Check for ipairs() compat mode

[tobias@...]

Hi,

Lua 5.3 had an ipairs() Compat which seemed enabled by default. 5.4  
has done away with it.

I have a implementation of an ordered hash table where I can

for i,v,k in ipairs(o) do
   print(i,v,k) -- k is the key for value at index i
end

The newer implementation of ipairs() does not honour if __ipairs  
returns more than 2
values.  Not a big issue but it would be nice if we can test for it.  
Here is my (rather
verbose) implementation:


t = setmetatable( {0,1,2,3,4,5,6,7,8,9},
   {
      __ipairs  = function( tbl )
         local idx = 0
         return function( key )
            idx=idx+1;
            if tbl[idx] then
               return idx, tbl[idx], 'foo'
            end end, tbl, 0
      end
   }
)

a,b,c = ipairs(t)
x,y,z = a(b,c)

if 'foo' == z then IPAIRS_IS_COMPAT end

Is there an easier way to test for it?

Thanks,
--tobbik