- update to 0.27.0:
  * Update uuidRepresentation warnings with "unspecified" as the
    future default (instead of 'standard' previously advertised)
    #2739
  * Added `mongo_client_class` optional parameter to connect() to
    allow to use an alternative mongo client than
    pymongo.MongoClient.
  * Fix DictField that always gets marked as changed #2606
  * fix for Queryset.none() that has no effect on
    update/aggregate / first #2669
  * Changes in 0.26.0
  * BREAKING CHANGE: Improved the performance of
    :meth:`~mongoengine.Document.save()`
    by removing the call to
    :meth:`~mongoengine.Document.ensure_indexes` unless
    ``meta['auto_create_index_on_save']`` is set to True. With
    the default settings, Document indexes will still be created
    on the fly, during the first usage of the collection
    (query, insert, etc), they will just not be re-created
    whenever .save() is called.
  * BREAKING CHANGE: remove deprecated method ``ensure_index``
    (replaced by ``create_index`` long time ago).
  * Addition of Decimal128Field:
    :class:`~mongoengine.fields.Decimal128Field` for accurate
    representation of Decimals (much better than the legacy field
    DecimalField).
  * BREAKING CHANGE: When using ListField(EnumField) or
    DictField(EnumField), the values weren't always cast into the
    Enum
  * BREAKING CHANGE (bugfix) Querying ObjectIdField or

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