[REBOL] /view slider data (size - 4) ?

[RChristiansen]

When I make a slider, how come the slider /data value reaches a maximum 
of four integers less than the size of the slider?

For example, to return a maximum /data value of 255, use the following...

REBOL []

face-one: layout [
        s: slider 10x259 [s/color: 0.0.0 + s/data show s print s/data]
] 

view/title face-one "face one"