Update to upstream version '0.3.5'
with Debian dir 94038e94a4a7870e94ddd3c21607eb5765f55955

this aims at preventing constant usage of isinstance() based dispatch
code when writing generic code handling model entities.

For example, the "object_type" argument of JournalWriter.write_addition() has
become superflous now we only pass model entities, etc.

This idea comes olasd's reading of mypy doc:

  https://mypy.readthedocs.io/en/latest/literal_types.html#tagged-unions

This comes with a refactoring of from_dict.DiskBackedContent to make
it *not* inherit from model.Content: object_type being Final, it cannot
be overloaded.

Update to upstream version '0.3.4'
with Debian dir e334e0831ed8569265e5d10f4d9516a48cf060af

Related to T2310

Related to T2310

Update to upstream version '0.3.3'
with Debian dir 9db77e99e1d97178ca2fa7289a0004b6147bdb0f

This is not used. This is broken storage wise (origin-visit-add does not deal
correctly with it and it so happens there is no test around it).

And finally, this will soon go away with T2310.

Update to upstream version '0.3.2'
with Debian dir dab2ec29758546752e72a90100424daa98318438

And adapt the revisions_d() strategy accordingly.

This can be None, according to the model.

for the sake of consistency.

Update to upstream version '0.3.1'
with Debian dir c220a7827eb7e16e523e5ae2dfd279c01e471c4a

thus in TimestampWithTimezone.from_dict(). This is needed to help consuming
existing (invalid) messages from kafka.

Warning: tests added in this revision do not cover the whole
normalize_timestamp() function.

Update to upstream version '0.3.0'
with Debian dir debf07387de123cf96eaad3d7d77bbfac925a2f7

Update to upstream version '0.2.2'
with Debian dir 51aef6acf2244bde6600fde8bbf280e818def7ee

This is a step forward having model objects, declared as frozen, immutable.

This requires attrs_strict >= 0.0.7.

the visit attribute is expected to be strictly positive.

Update to upstream version '0.2.1'
with Debian dir 4b98cf559c2be2a001dbedc9894b2431ce1b9373

this attribute is not an intrinsic property of a content object, so it
should not be used when comparing or hashing.

Update to upstream version '0.2.0'
with Debian dir 8fcf4e24544576e706428aa2483d4697a23e8b3b