Exploring Kotlin’s hidden costs

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There are two excellent articles about the internals of some language constructs and their performance implications:

• Exploring Kotlin’s hidden costs — Part 1
• Exploring Kotlin’s hidden costs — Part 2

Are there any plans from JetBrains to improve some of the mentioned points?

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Here is a great analysis of the actual costs: Kotlin’s hidden costs - Benchmarks. Spoiler: the hidden “costs” are negative in several cases!