> At one point we have an issue with requiring a specific version of diff/lcs, which means we wouldn't be able to get it out as a bugfix for 2-14,

That's why I'm bringing this up now: 3.0 is the right time to start depending on a newer version of diff/lcs if we're going to do that.  I didn't mean for the fix that'll go into 2.14 to use a new version of diff/lcs.