Terje Norderhaug terje@in-progress.com writes:
I use it on the client to check a priori whether a frame can be restarted.
I did not intend FRAME-RESTARTABLE-P to necessarily work reliably. Perhaps an implementation has a short, and a long path to find it out, and because the long path would be too time-consuming, it implements FRAME-RESTARTABLE-P only going through the short path.
Furthermore, I think FRAME-RESTARTABLE-P should become a FRAME-ATTRIBUTES function with :RESTARTABLE, and :NON-RESTARTABLE being the currently specified values.
-T.