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On Jan 31, 2012 11:08 PM, "Nick Coghlan" <ncoghlan@gmail.com> wrote:
> PJE is quite right that using a new named protocol rather than a
> callback with a particular signature could also work, but I don't see
> a lot of advantages in doing so.

The advantage is that it fits your brain better.� That is, you don't have to remember another symbol besides the type you wanted.� (There's probably fewer keystrokes involved, too.)