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> > Here is some code to play with. The first bit is your userdata binding,
> > second bit is the Lua register operator. Its a bit like trying to do
> > operators in C++. You have to specify the operator explicitly using regop.
> > Hope this answers your question.
> Yes. I thought I would need something like this. I'm not entirely happy
> with the extra steps (one extra function call and a lookup in a table),
> but this method is indeed pratical and general.

Hopefully someone else will come up with a quicker solution or optimise mine

I'm sure there must be other ways of doing it using tagmethods which might be
quicker but a little messy, and probably more error prone(?)

Anyway its lunch now :-)