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Let's assume I've given nil and metatable and in the examples below made nil's metatable accessible via nilmt.

It seems that setting a __len metamethod for nil also affects other types (eg, functions):

> nilmt.__len = function()return 7 end
> return #nil
> return #function()end

Now, I don't really have an excuse for poking around in this dark corner, but...
is this intended?