Optional typing might be the worst or best idea ever. I'm more & more leaning toward the best idea ever direction.
Also +Gilad Bracha is promising Smalltalk-style edit-debug-edit-debug-cycles (without restarting the program). If you've ever worked with VisualWorks or another Smalltalk environment that supports this, you will agree that every other programing environment, including every single one in mainstream use today, feels like the stone age.
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