GeoServer and PostgreSQL JSON column

For those wondering, at version 2.13.0, GeoServer started supporting HStore and JSON columns for PostGIS data stores. The site says:

The PostGIS data store now has simple support for HStore and JSON columns. HStore is returned as a Map and will render as a JSON formatted string field in common WFS output formats, while JSON is read as a string and rendered as-is. In both cases no special query support has been added for those types (but we’d be very happy if someone would work, or sponsor, that functionality too).