nil's metatable

[David Jones <drj@...>]

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
7
> return #function()end
7

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

drj