• Removed Version1 and Version 2 (which were deprecated earlier this year).
• Minimum PHP Version: 8.1.0
• Removed HKDF polyfill
• Removed __toString() weirdness for PHP < 7.4
• Lots of code clean-up; making use of the updated type system in PHP 8.1
• Use Corner for more helpful exceptions.
• Removed all hacks and annotations to make Psalm happy. Our code is now fully statically analyzed on every CI/CD push.