Stack politeness

[benjamin sunshine-hill <bsunshin@...>]

When making C functions to expose to Lua, what guidelines should the 
function adhere to in terms of the state of the stack upon return? Of 
course, the return values need to be at the top, and equal to the integral 
return value of the function, but what about arguments to the function? 
Must they be removed? preserved? does Lua not care?