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* Fixed a bug that would cause set queries lookups of attributes values
containing spaces to always fail. When performing a set queries for an
``attribute=value`` pair, if a value contains a space, it must be quoted, and
it will be properly parsed.
* When performing a set query for an attribute that does not exist, an error is
raised.
* When performing a set query, if no attribute pairs are found, an empty set is
returned.
* Docs: Fixed a typo in data model doc
* Docs: Fixed incorrect year for a bunch of entries in changelog