classed

And nor does it.  What happens is that a new object is constructed from x,
with (in this case) extra bits and pieces tacked on and (here) that new
object is assigned the name y.

Writing a function to modify its argument is possible (e.g. fix() does it)
but not altogether straightforward, especially if you want it to work in
the most general case.

Hmmm, OK now that I test it out you are quite correct. But that implies
that the whole object is copied because later modification of either the
original or the result do not propagate between x and y... unless R has
some sort of copy-on-write flag which I never noticed when wandering 
through the R source (a lot probably falls into that category).

If it doesn't use copy-on-write then the result will be additional
slowdown when all your data is copied again and again (I guess it depends
on how big the object is).

	- Tel
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