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kotlinlang

Any chance we can have `Double.toString(decimals: Int)` as a publicly available function? It seems to already be implemented as part of `Duration`.

<https://github.com/JetBrains/kotlin/blob/rrr/2.1.0/core-docs/libraries/stdlib/src/kotlin/time/Duration.kt#L1058>

I guess it would be useful to note in <https://youtrack.jetbrains.com/issue/KT-21644/Add-utility-function-for-formatting-of-decimal-numbers-to-Kotlin-common-library> that stdlib has such a private implementation already