If this extension is true then the OIDs (primary keys) of referenced instances are retrieved along with the default fetch group fields. This extension defaults to true as this usually provides better performance for the datastore (it is expensive to query for fields not read during the first select). The oids-in-default-fetch-group extension can be set at the class level.
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<class name="Order">
<extension key="oids-in-default-fetch-group" value="false" />
</class>
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