🚀 go-pugleaf

      I thought the whole point of forwarding messages was to forward
      the message.  What does it mean to forward a message with no
      included text?

It prevents having to send mail using the m command and manually fill
in the subject line when you want to make a comment on a piece of mail
without including it.  z fills it in for you, just the way r and f do.

For example, if somebody sends you and me and 500 others mail entitled
"code for z/Z", and you are the site administrator, and I want to ask
you if it's already implemented somewhere, it's wasteful to include
text that you have already read, so I use my z command and ask you.

On the other hand, if it's detailed and I want to refer to something
in the mail, then I use my Z command, which is just like the original
z command you get out of the box with vm.

Also, it's consistent with f, F, r, and R.