possiblt bug in #lowBit and #highBit

[Douglas Brebner]

I'm writing some bit manipulation code and think I've found a bug in
#lowBit and #highBit (from numeric.slate and integer.slate)

It appears that these methods don't handle the case of the integer = 0

Slate 69> 0 lowBit.
0
Slate 70> 1 lowBit.
0
Slate 71> 2 lowBit.
1
Slate 72> 4 lowBit.
2

and the same for highBit.

Any suggestions as to how they should handle this case?

-- 
Douglas