It turns out that using a custom serializer on an
input stream did not work well. For one the stream seems
to be getting closed before the JSON gets written. But
also the method for writing it was throwing an
UnsupportedOperationException further down in Jackson.
The above simplifies the matter by simply outputting the
Base64 string first and then setting it on the model.
git.nmode.ca / signal-cli / commit
