Its okey or not?

Test 1 OK
type(((''):byte())) 

Test 2 ERR bad argument #1 to 'type' (value expected)
type((''):byte()) 

Test 3 OK
string.byte = function (s) return nil  end
type((''):byte())

Test 4 ERR bad argument #1 to 'type' (value expected)
string.byte = function (s) return  end
type((''):byte())

"function x() return end" not equal "function x() return nil end"? 
This case is for all Lua versions.  

This behavior is probably well-known, but I've never encountered it before. I 
thought if a type received a nil, it would simply return a nil, but 
sometimes there's literally nothing there, not a nil. Now I'm paranoid 
about wrapping everything in parentheses, even if the function returns only 
one value :D  haha and/or if function return nothing im force wrote return 
nil

I thought I'd share. It seems I still don't know Lua ::)

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