Using Observable from standard library

Did anybody have any success using Observable module from stdlib with Rails? (version doesn’t matter).

The problem I encountered is that changed method from ActiveModel::Dirty conflicts with changed from Observable.

https://github.com/rails/rails/blob/5bc90022eb024bd6979497e12091d4a16e8288ff/activemodel/lib/active_model/dirty.rb#L137
http://ruby-doc.org/stdlib-2.0.0/libdoc/observer/rdoc/Observable.html#method-i-changed

I wonder if there is any reasonable alternative rather than re-implementing Observable.