Thank you. I was wondering the same thing. I glanced at the information and, if I understand it correctly, 4.0.0 is the first release of a ground up rewrite.

Thank you. I was wondering the same thing. I glanced at the information and, if I understand it correctly, 4.0.0 is the first release of a ground up rewrite. What's not immediately clear (and perhaps because I did not read the material clearly enough) is if any significant features were added. I wonder because I find it hard to rewrite something without taking advantage of the opportunity to add features. Or perhaps the desire to add features that would be difficult with the 3.x.x code drove the upgrade.