The Country That Broke Kotlin Logic vs language: how a Turkish alphabet bug played a years-long game of hide-and-seek inside the Kotlin compiler When Turkish software engineer Mehmet Nuri Öztürk …

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A deep dive into a five-year Kotlin compiler bug caused by locale-sensitive string case conversions. Turkish developers experienced build failures and runtime crashes because functions like toLowerCase() and capitalize() behaved differently with Turkish language settings, where the letter 'i' has dotted and dotless variants. The bug affected compiler output parsing, coroutine boxing functions, and array intrinsics before being systematically fixed in Kotlin 1.5, leading to the deprecation of locale-sensitive case conversion functions in favor of locale-agnostic alternatives.