Has anyone looked into decision F6 ?
https://github.com/basho/webmachine/blob/master/src/webmachine_decision_core.erl#L279

Why set a content-type header when the response can easily be 204 No Content or 303 See Other or 201 Created, etc?
To take it further, why require content_types_provided to provide at least on content type if the resource does not respond with an entity?

Isn't setting a content-type header closer to O11, where the etag and body generation takes place?
https://github.com/basho/webmachine/blob/master/src/webmachine_decision_core.erl#L524