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>> I'd prefer some sort of @+, @-, @/, @%, @//, @^, @= for integer operators.
> There is no need to introduce new metamethods for these operators.

Also nice maybe. But I think "@=" in your list is accident? Or what
would be purpose of "@="? (and then of course @/ would replace // I
think (NOT @//).

... but having some more metafunctions in any case would be nice I
think, why not (if it does not slow down Lua at critical points...)
... if you use metamethods for a special variable type, you typically
will be happy to have as many options as possible.