Re: maybe-commit fails unconditionally

   Date: Sat, 24 Oct 2009 14:08:39 -0400
   From: Roderic Morris <[email protected]>

   I'm curious though, what's the reason for having maybe-commit set the
   proposal to #f instead of installing an empty one?

After a transaction is committed, what is the value of immediately
starting a new one?  Unless there is a good reason to do so,
installing an empty proposal would mask program errors -- and if you
have a good reason to do so, then you should probably be starting a
transaction explicitly anyway.