We use vendor specific media types for all our resources and use versions to differentiate between breaking changes to that resource.

For example:

application/vnd.linn.space-configuration+json; version=1

is our current media type for application/vnd.linn.space-configuration+json and type-is correctly returns the type when +json is used. However, the versioning is lost and we have no way to differentiate between a version 2 of this resource when it becomes available.