Untested, and it does not yet update transfer logs.
Verifying transferred content is modeled on git-annex-shell recvkey.
In a direct mode or annex.thin repository, content can change while it's
being transferred. So, verification is always done, even if annex.verify
would normally prevent it.
Note that a WORM or URL key could change in a way the verification
doesn't catch. That can happen in git-annex-shell recvkey too. We don't
worry about it, because those key backends don't guarantee preservation
of data. (Which is to say, I worried about it, and then convinced myself
again it was ok.)
