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I can think of a couple of practical uses, the biggest one that comes to mind is helping places like CodeSchool do in browser PHP tutorials with the code actually executing. So definite practical uses :)

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This an very valid reason. The other one could be user-frontend editing of wordpress widgets or similar little nasty diy codebits.

Great use case, might I add.

As someone whose initial reaction was "God why?" I stand corrected--that's an excellent use for this project.

Must admit I had the same reaction and then it clicked and was much more impressive.

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