Frank Shearar uploaded a new version of Kernel to project The Trunk:
http://source.squeak.org/trunk/Kernel-fbs.753.mcz

==================== Summary ====================

Name: Kernel-fbs.753
Author: fbs
Time: 31 March 2013, 9:48:19.626 pm
UUID: fed54ba8-20d7-48c6-b61f-939552ef780c
Ancestors: Kernel-fbs.752

Preserve Fraction's invariant of always using fully reduced fractions.

=============== Diff against Kernel-fbs.752 ===============

Item was removed:
- ----- Method: Fraction class>>zero (in category 'constants') -----
- zero
- 	^ self numerator: 0 denominator: 1.!