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2011/10/13 Xavier Wang <>:
> Hi list :)
> I had notice a incompatible with Lua5.1 and Lua5.2-beta, that is in
> Lua 5.2 beta, the __len meta-method has two operand! though they are
> the same one (the userdata I used # operator),

The manual says:
> "len": the # operation.
>     function len_event (op)

Why do you say the __len metamethod has two operands?