There is a bug with the most of the flags messages to number and flonum.
Only the "flags 32" bit works, the others doesn't.
This is with Max 5.0.2 on MacOS 10.4.11 and a MacBook Pro 2.2 GHz
While at it I would suggest a new option/attribute "Don't send value on
deselect". This could be usefull when typing new values into numer boxes
with the keyboard, which I tend to do a lot. Also in live situations...