Mercurial’s journey to and reflections on Python 3
For me this is the most exciting outcome:> The only Python 3 feature that Mercurial developers seem to almost universally get excited about is type annotations. We already have some people playing around with pytype using comment-based annotations and pytype has already caught a few bugs. We're eager to go all in on type annotations and uncover lots of dynamic typing bugs and poorly implemented APIs.Over in perl land people still spill their hate on types, which caused hard forks.