Tag model entities with their "object_type"
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.
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