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Dirk Laurie <[email protected]> writes:

> 6. insert(a,b) does not do the same as insert(a,b,nil).  This 
>     behaviour would not be possible for a function of three arguments
>     written in Lua itself.

Huh?

function arity(...)
  return select('#',...)
end
print(arity(1,2),arity(1,2,nil))

returns

2       3

-- 
David Kastrup