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Really great piece; definitely a great writer even in a heavily technical piece like this.

Interested to al3x's thoughts on the RoR vs. Python-Django also.

If, on the other hand, you’re working with a system that allows for a variety of concurrency approaches (the JVM, the CLR, C, C++, GHC, etc.), you have the flexibility to change your concurrency model as your system evolves.

I think you have his thoughts right there. Ruby and python don't allow for a variety of concurrency approaches...at least not on the threading side. You have to resort to multi-process or evented schemes.

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