a (sort of) bug in Lua 5b?

[j.wattam-bell@...]

I just got an address exception in the Lua 5b api. It happened when calling 
lua_getmetatable with an invalid stack index.

The problem seems to be that with an invalid index, ttype(obj) in the switch 
statement (in lua_getmetatable) has a null argument.

I guess it's stretching a point to call this a bug - I should check the index 
before calling the function - but Lua is usually so polite and forbearing when 
subjected to this kind of maltreatment. And I apologise for raising it at this 
late stage.

jwb