By using blobs we massively increase our maximum patch size. When stored directly on the record patches can be at most 2 MiB. By moving it to a blob, we get a minimum of 50 MiB (smaller if the pds has set it but 50 is the default). legacy field name `patch` in `repo.pull` lexicon is preserved (but not used) to support some level of backward compatibility Signed-off-by: Samuel Shuert <me@thecoded.prof> Signed-off-by: Seongmin Lee <git@boltless.me>