Help decompile lua script (Mafia 2)

Po studied freeriding and I found out that instead of _ARG_0_, l_1_0 is written.


I decompiled the script using the Lua Viewer program,
but the program does not completely decompile the script, there are errors, _FORV_4_, _UPVALUE1_ ...
_FORV_4_, _UPVALUE1_, that instead of these is written knows ???