It won't be covered in the book. The source code has to be useful for something, after all.
Larry WallWell, you can implement a Perl peek() with unpack('P',...). Once you have that, there's only security through obscurity.
Larry WallWe don't have enough parallel universes to allow all uses of all junction types - in the absence of quantum computing the combinatorics are not in our favor.
Larry Wall