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> I could try Dart, which will cost me a significant amount of performance in all browsers that aren't Chrome

But will it, though? Sure, "Hello, World" transpiles to 17,000 lines of code, but I'd want to see some actual benchmarks of actual code to see what kind of performance hit that implies, before deciding against Dart on that basis.

And then there's the whole python argument about developer time being more valuable, and most applications these days not being performance constrained, etc, that could possibly apply here, as well.

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