Merge branch 'rh/peeling-tag-to-tag'

Make "foo^{tag}" to peel a tag to itself, i.e. no-op., and fail if "foo" is not a tag. "git rev-parse --verify v1.0^{tag}" would be a more convenient way to say "test $(git cat-file -t v1.0) = tag". * rh/peeling-tag-to-tag: peel_onion: do not assume length of x_type globals peel_onion(): add support for <rev>^{tag}