Single unified GeoJSON type
Generating a schema and consuming GeoJSON data in Realm is painful. Since GeoJSON has multiple 'types', Realm forces us to store a serialized string version of our GeoJSON, or to abstract our data out so that all GeoJSON objects follow the same generalized schema, which breaks some of the conveniences of GeoJSON.
Realm should allow for a GeoJSON type OR allow the schema to be dynamic (such as supporting ORs in the schema language itself).
Support for geospatial data is ongoing - see the following documents for more information:
https://www.mongodb.com/docs/atlas/app-services/schemas/types/#geospatial-data
https://www.mongodb.com/docs/realm/sdk/node/model-data/data-types/geospatial/ (this for Node.js - see the other SDKs under "Data Types")