only RemoteStore and the daemon loop ever call this method, and the
remote store call site isn't even particularly well done. we do not
have to create a bitstream, check whether our remote understands it
at all, only to parse it again if the remote doesn't understand it.
we can instead just use data we already have and avoid many copies.
Change-Id: Ib20740df16555269cbb19c7b12937280a00fc1f0
eldritch horrors
ea6f2214e6