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You're probably aware of Smalltalk already but in case you're not, I think it might be of interest to you. There's an open source implementation of Smalltalk called Pharo. They have a few screencasts and recordings of presentations at their website. http://pharo.org/documentation

Edit: Checked your profile. Going to say that yes, you almost certainly know about Smalltalk -- far more than do I.

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There is a lot to be said for a language where a single edit somewhere in a program can't have snowballing effects across the entire codebase. In practice, that means deferring logic to the runtime...

I would argue this a lot with people like Gilad Bracha :), but ya. Incremental compilation is pretty trivial in Smalltalk though given the lack of a static type system.

...and no explicit native macro system either (lot can be laid atop it of course...).

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