Attempting to repeatedly creep right from the final document character (try
10 creeps in a row) permanently slows all of Archy down even across
restarts. CPU usage during any cursor movement goes from sipping 5-7% before
the slowdown to 100% after the slowdown. The Humane Document's size also grows 
much more rapidly than normal. This same bug also applies to the initial 
character. I assumed this was related to the run length encoding bug but it 
was not; It appears to be a behavior issue when applied to the first and last 
character.