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Why do you say low development overhead isn't one of them? Outside of the one-time cost you pay to learn the language (which is higher than Go and most languages), Scala makes it super easy to write correct code quickly. The developer workflow of incremental compile + REPL + unit tests is great.

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Probably depends on the code base, but having worked with Scala for a few years, there are a lot of things that causes development overhead. First things that come to mind: slow compile times, there are usually several ways to do one thing and also docs/guides are inconsistent, overused operator overloading in libraries (almost have to learn new DSL syntax for some libs), and it is not always easy to comprehend code by other developers.

not bagging anything you're saying, but I found slow compile times more or less go away if I open an sbt and type ~ compile to have it auto compile on save

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