How to handle RCs in terms of PORTVERSION and friends?

[Gerald Pfeifer]

Right now I find myself in the situation that Wine went into RC mode
and the current snapshots are of the form 1.0-rc1, 1.0-rc2 etc.  Per
the Porters Handbook this means I have prepared an update with

 PORTVERSION=    1.0r1

This works just fine and is higher than the previous releases of the
form 0.9.61.

However, what is going to happen with version 1.0 a bit later?

  % pkg_version -t 0.9.61  1.0r1
  <
  % pkg_version -t 1.0r1 1.0
  >

How can I best address this?  I'm sure I am not the first ports
maintainer running into an issue like this, and bumping EPOCH does
not look like the desirable solution here.

Gerald @FreeBSD.org