Works nicely and efficiently, too bad the documentation is dificient.
I wish there was a way of making it try to cut at word boundaries rather than search greedily: e.g. if you compare "this that" and "that", String::Diff will tell you that "is th" was removed. This is true, but not great if you want to show a diff that makes sense to the end user.
Provides a straightforward means of comparing differences in two strings, and marking those differences in a chosen manner.
The module looses two stars, one for its documentation: a verbose Synopsis, but not explanation of how to get the advertised coloured terminal output.
The other problem is that the output of diff_fully: a list of tokens is a useful idea for me, but having several 'unchanged text' tokens in a row is something I would hope not to have to optimise away myself.