There is an API method (/entity/ENTITY_ID/type/TYPE_ID/) to attach a type to an entity. The example given is that a "birthdayParty" is a "date".
How does one retrieve the type back? It does not seem to be included in the /entity/ENTITY_ID/values response.
Also, will it be possible one day to use the type to filter entity lists or determine membership in contextual bundles?