How do you read a GeoJSON file that contains a single feature with the GeoTools gt-geojsondatastore plugin?

Question

I have successfully processed files that contain a FeatureCollection using a GeoJSONDataStore, but when the file contains a single Feature, all I can manage is to get an empty FeatureCollection when I call getFeatures from the FeatureSource obtained by calling getFeatureSource on the GeoJSONDataStore.