why does tolua clear the stack?

[Asko Kauppi <Asko.Kauppi@...>]

Tolua-generated code seems to call 'lua_settop(0)' in between reading the
arguments and pushing the return values. Why is this? Could someone knowing
the Lua internals comment on whether this is good, bad, or does not matter?
Examples in Lua manual (5.0) don't do such a thing.

Thanks. 
- asko


>static int
>wrap_SDL_JoystickName(lua_State *L)
>{
>    char * _result;
>    int  _arg0;
>
>{_arg0 = ( int )luaL_check_long(L, 1);}
>	lua_settop(L, 0);
>    _result = (char *)SDL_JoystickName(_arg0);
>{LS_luaL_pushstringpointer(L, _result);}
>	return 1;
>}

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