[Moo] Backward compatibility 1.2.5 of 1.2.0 versions

[Neurostep]

Hi everyone! It so happened that on the website of my company uses
mootools version 1.2.0. It turned out that IE9 a mootools problem, the
need to move to version 1.2.5. Can I safely upgrade to this version or
encounter any problems? So many scripts written for 1.2.0