My use case for the datastore api involves creating entities with at least one ndb.TextProperty. These sometimes are more than 500 characters, so if I just stick it on the Entity as a property, the save fails. I've read a bunch of the docs (including for the datastore JSON api) and can't find any indication for how to specify that something should be a text property rather than a string property (as indicated by the datastore). Is this something that's supported? If so, any help for how to do it would be appreciated!