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kotlinlang

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If I'm not mistaken, for new line in JVM
it is proper to use `System.lineSeparator()`
But in the Kotlin standard library it's just `'\n'`

So, I'm confused by this. Is that by design?

So, I end up with own
```fun StringBuilder.appendLine(value: String) {
    append(value).append(System.lineSeparator())
}```
in my project

There used to be a <https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.text/appendln.html|StringBuilder.appendln> extension function which appended `System.lineSeparator` but it was deprecated in Kotlin 1.4. See <https://youtrack.jetbrains.com/issue/KTLC-27/Deprecate-appendln-in-favor-of-appendLine>.