diff --git a/runtime/src/main/kotlin/kotlin/text/StringBuilderNative.kt b/runtime/src/main/kotlin/kotlin/text/StringBuilderNative.kt
index 55fcc40104f..f73b1c2f7f9 100644
--- a/runtime/src/main/kotlin/kotlin/text/StringBuilderNative.kt
+++ b/runtime/src/main/kotlin/kotlin/text/StringBuilderNative.kt
@@ -5,14 +5,63 @@
 
 package kotlin.text
 
-fun StringBuilder.appendln(it: String) = append(it).appendln()
-fun StringBuilder.appendln(it: Boolean) = append(it).appendln()
-fun StringBuilder.appendln(it: Byte) = append(it).appendln()
-fun StringBuilder.appendln(it: Short) = append(it).appendln()
-fun StringBuilder.appendln(it: Int) = append(it).appendln()
-fun StringBuilder.appendln(it: Long) = append(it).appendln()
-fun StringBuilder.appendln(it: Float) = append(it).appendln()
-fun StringBuilder.appendln(it: Double) = append(it).appendln()
-fun StringBuilder.appendln(it: Any?) = append(it).appendln()
+/** Appends [value] to this [StringBuilder], followed by a line feed character (`\n`). */
+@SinceKotlin("1.4")
+@kotlin.internal.InlineOnly
+public inline fun StringBuilder.appendLine(value: Byte): StringBuilder = append(value).appendLine()
 
-fun StringBuilder.appendln() = append('\n')
+/** Appends [value] to this [StringBuilder], followed by a line feed character (`\n`). */
+@SinceKotlin("1.4")
+@kotlin.internal.InlineOnly
+public inline fun StringBuilder.appendLine(value: Short): StringBuilder = append(value).appendLine()
+
+/** Appends [value] to this [StringBuilder], followed by a line feed character (`\n`). */
+@SinceKotlin("1.4")
+@kotlin.internal.InlineOnly
+public inline fun StringBuilder.appendLine(value: Int): StringBuilder = append(value).appendLine()
+
+/** Appends [value] to this [StringBuilder], followed by a line feed character (`\n`). */
+@SinceKotlin("1.4")
+@kotlin.internal.InlineOnly
+public inline fun StringBuilder.appendLine(value: Long): StringBuilder = append(value).appendLine()
+
+/** Appends [value] to this [StringBuilder], followed by a line feed character (`\n`). */
+@SinceKotlin("1.4")
+@kotlin.internal.InlineOnly
+public inline fun StringBuilder.appendLine(value: Float): StringBuilder = append(value).appendLine()
+
+/** Appends [value] to this [StringBuilder], followed by a line feed character (`\n`). */
+@SinceKotlin("1.4")
+@kotlin.internal.InlineOnly
+public inline fun StringBuilder.appendLine(value: Double): StringBuilder = append(value).appendLine()
+
+
+@Deprecated("Use appendLine instead", ReplaceWith("appendLine(it)"), level = DeprecationLevel.WARNING)
+public fun StringBuilder.appendln(it: String): StringBuilder = appendLine(it)
+
+@Deprecated("Use appendLine instead", ReplaceWith("appendLine(it)"), level = DeprecationLevel.WARNING)
+public fun StringBuilder.appendln(it: Boolean): StringBuilder = appendLine(it)
+
+@Deprecated("Use appendLine instead", ReplaceWith("appendLine(it)"), level = DeprecationLevel.WARNING)
+public fun StringBuilder.appendln(it: Byte): StringBuilder = appendLine(it)
+
+@Deprecated("Use appendLine instead", ReplaceWith("appendLine(it)"), level = DeprecationLevel.WARNING)
+public fun StringBuilder.appendln(it: Short): StringBuilder = appendLine(it)
+
+@Deprecated("Use appendLine instead", ReplaceWith("appendLine(it)"), level = DeprecationLevel.WARNING)
+public fun StringBuilder.appendln(it: Int): StringBuilder = appendLine(it)
+
+@Deprecated("Use appendLine instead", ReplaceWith("appendLine(it)"), level = DeprecationLevel.WARNING)
+public fun StringBuilder.appendln(it: Long): StringBuilder = appendLine(it)
+
+@Deprecated("Use appendLine instead", ReplaceWith("appendLine(it)"), level = DeprecationLevel.WARNING)
+public fun StringBuilder.appendln(it: Float): StringBuilder = appendLine(it)
+
+@Deprecated("Use appendLine instead", ReplaceWith("appendLine(it)"), level = DeprecationLevel.WARNING)
+public fun StringBuilder.appendln(it: Double): StringBuilder = appendLine(it)
+
+@Deprecated("Use appendLine instead", ReplaceWith("appendLine(it)"), level = DeprecationLevel.WARNING)
+public fun StringBuilder.appendln(it: Any?): StringBuilder = appendLine(it)
+
+@Deprecated("Use appendLine instead", ReplaceWith("appendLine()"), level = DeprecationLevel.WARNING)
+public fun StringBuilder.appendln(): StringBuilder = appendLine()
\ No newline at end of file