Control over backend diffing tool #5
Description
So while Data::Difflet is neat to use when a test's output is to stdout, it's not nearly so great when output is redirected or piped: then we get lots of ascii color sequences inline.
It would be nice to allow the user to customize the backend diffing tool that gets used. It would be nice for deep_ok() to automatically switch between Data::Difflet and something else (what? maybe something that produces a unified diff, since people have learned how to read those) when it notices that that's probably the right thing to do.