TODO: make a list of points on which this spec is unclear #174

As part of the transition process to the 1.0 format, let's make a list of issues on which the spec is currently not saying anything, but we feel it should say something.
To start off, I'm aware of the following ones:

• webid-oidc client_id's
• WAC-Allow headers
• WebSockets-pubsubs access control
• deleting non-empty containers
• trailing slashes in ACL docs