A second Accept value would have overwritten the first, because the header was Set per value rather
than Added. One value is all any caller passes today, so nothing was wrong — but a helper that
quietly keeps only the last of what it was given is a trap for whoever passes two.
And a replayed announcement that could not be written was published as an empty body: a fact on the
mesh that says nothing, which the reader can only log and drop. It is now said and skipped, because a
body that cannot be marshalled is this program's fault rather than the bus's.
jschoubben