In effect, allows to write all but the colliding contents to the storage. This
is the same behavior currently existing in the journal replayer (D2800). This
shares the behavior within the retry proxy as this is a common need, for
example in loaders as well (D2973).
And the colliding hashes are stored in the log in a formatted way so we do not
lose that information.
It could go in an entirely different proxy. That would maximize composition
through configuration and not entangle the retry and that new behavior (which
is somehow a retry, thus why it's proposed here in the first place ;)