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You have to change the code a lot more to port it to an entirely different language.

Of course, but the point is that you shouldn't really need to spend weeks updating your code just to upgrade to a newer version of the compiler.

I know right, you usually have to change a lot of code just to change versions of a framework.

One of my teammates just upgraded our django framework from 1.4 to 1.8 and it took him almost an entire week to do.

A week! It took me six months to port our main app from django 1.5 to 1.8. Though our app is huge, and most of that was migrating from DRF 2.3 to 3.3.

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