bundle: consistently keep a list of stringified revisions in "revs"

Before this patch, "revs", in the "not base" branch, would be a list
of mixed integral revnums, hex nodeids, and branch names. After this
patch, they're all strings. They can still be a mix of hex nodeids and
branch names, but the important thing for my future patches is that
they're consistently in string form.

Differential Revision: https://phab.mercurial-scm.org/D3049

mercurial/commands.py

@@ -1231,6 +1231,7 b' def bundle(ui, repo, fname, dest=None, *'
         dest = ui.expandpath(dest or 'default-push', dest or 'default')
         dest, branches = hg.parseurl(dest, opts.get('branch'))
         other = hg.peer(repo, opts, dest)
+        revs = [repo[r].hex() for r in revs]
         revs, checkout = hg.addbranchrevs(repo, repo, branches, revs)
         heads = revs and map(repo.lookup, revs) or revs
         outgoing = discovery.findcommonoutgoing(repo, other,