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You probably don't. Kotlin, for example, seems like a great language. No big deal. Why does anyone have to convince you? Carry on. Now, those of us that use Go would like to carry on too.

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Is Kotlin's type system identical to Java's?

One difference is that Kotlin's types are non-nullable by default http://kotlinlang.org/docs/reference/null-safety.html

Another is that there are no primitive types.

It's very similar, yes.

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