[Moo] bug in fx.morph unit: '%'

[hamburger]

I'am usinfg this code:

                   var pan = $('case');
                   var i = 2
                   pan.set('morph', {unit: '%', duration:
400}).morph({left: (-100 * i)});

it works fine in firefox.
in chrome and ie it fire first the left-assignment in pixel. (left:
-200px)
Only with the second click are the % given . (left:-200%)