The message
from "." contains these words:

why call it a /compression/ joint then ? in your world it would be
called a deformation joint which it isn't, it's a /compression/ joint.
methinks you're splitting hairs, why is anyones guess but if the
copper *tube* /deforms/ the joint is and will be defective.

If I show you a bit of copper pipe with a narrow neck in it, would you
say that was deformed?

'Cos that's what it looks like if you cut the olive off after taking
apart a correctly assembled compression joint.

--
Skipweasel
Pay no attention to that man behind the curtain.