sproutcore/sproutcore20 — comment on commit f0e9907cbe36c7265ed565d7f985de6d14ad6b9c
File:  line 0
By trek:

There are no tests, so I can see why it got missed, for it but Binding comments still refer to #reopen as a way to extend a Binding object. Maybe a quick look for SC.Object specific documentation is in order?