I've noticed a couple of small, but important issues with how data types are handled in Swagger schema generation:

1. The format field, which can add helpful context to string types, isn't being used at all (except in this special case). This could be used to distinguish, for example, a plaintext string field (such as a description or name field) from a UUID field (which would be signified by "format": "uuid").
2. When dealing with Array types (from M2M or FK fields, for example), the item type is always set to "string" (see here). There are many scenarios where this doesn't make sense, e.g. when you have a ForeignKey field pointing to a model that uses an IntegerField as its primary key.

Is this something that's on your radar? I'd very much like to see these changes happen (and I'm willing to do the work!).