On Wednesday, September 14, 2011, Richard Stallman <rms@gnu.org> wrote:
> It is not an issue of how many "ways to exit isearch" there are. It
> is an issue of how many commands you need to remember WON'T exit the
> search. The idea of isearch is that control characters exit, except
> for a short list of a few. But that list has been growing.

But does it make sense to think of C-u as a command in itself? It's *always* used in conjunction with another command, which may exit isearch or not.

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-PJ