Yes. It's just the 21st bit of a 20 bit stamp with type B would _have_ to be 1 whereas now (type A) it can be either 0 or 1. That restriction affects variance (maybe) and affects creation cost.
That's the statistical calculation I was commenting on.
-------------------------------------------------------------- from: Jonathan "Chromatix" Morton mail: chromi@xxxxxxxxxxxxxxxxxxxxx website: http://www.chromatix.uklinux.net/ tagline: The key to knowledge is not to rely on people to teach you it.