Issue when outputting differences in ascii format with unicode chars

[damian-m-g]

Hello sir. Please take a look at this:

The outputt:

How it looks when you write this content to a file:

The problem, found in ascii.rb:

The inspect is the problem. Is fine with none unicode strings, but when unicode appear it mess. The workaround we made:

How the file where string was written looks:

If this is okay for you, I can make a pull request, I'm not sure if fills expectations, probably it could be improved. Cheers.