[Aanson]

Originally Posted by Seerah If you take away the "local", then yes - it will be a global. Unless you declare that variable as local in your upvalues (outside of the function, therefore local to your whole Lua file.)

Thanks all.

So with this example, just so I've got it straight in my head:

M.GetData_CalculateListingValue = function(announce)
    announce = (announce or false);
    -- doing stuff with announce
end

The function argument 'announce' will now be a global because it wasn't declared local within the function?