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> This is the test code.
> 
> > local mt = {}
> > function mt:__isdef()
> > 	return true
> > end
> > local t = setmetatable({}, mt)
> > print(t.a == undef)
> 
> And the output is:
> > >>lua test.lua
> > lua: test.lua:6: attempt to call a boolean value (global 'print')
> > stack traceback:
> >         test.lua:6: in main chunk
> >         [C]: in ?

Yes, this is a bug. Thanks for the report.

-- Roberto