Stabilize new string and char case conversion API KT-45873

libraries/stdlib/js/src/kotlin/text/char.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -21,10 +21,10 @@ public actual inline fun Char.toLowerCase(): Char = lowercaseChar()
  *
  * @sample samples.text.Chars.lowercase
  */
-@SinceKotlin("1.4")
-@ExperimentalStdlibApi
+@SinceKotlin("1.5")
+@WasExperimental(ExperimentalStdlibApi::class)
 @kotlin.internal.InlineOnly
-public actual inline fun Char.lowercaseChar(): Char = toString().asDynamic().toLowerCase().charCodeAt(0).unsafeCast<Int>().toChar()
+public actual inline fun Char.lowercaseChar(): Char = lowercase()[0]
 
 /**
  * Converts this character to lower case using Unicode mapping rules of the invariant locale.
@@ -36,10 +36,10 @@ public actual inline fun Char.lowercaseChar(): Char = toString().asDynamic().toL
  *
  * @sample samples.text.Chars.lowercase
  */
-@SinceKotlin("1.4")
-@ExperimentalStdlibApi
+@SinceKotlin("1.5")
+@WasExperimental(ExperimentalStdlibApi::class)
 @kotlin.internal.InlineOnly
-public actual inline fun Char.lowercase(): String = toString().asDynamic().toLowerCase() as String
+public actual inline fun Char.lowercase(): String = toString().asDynamic().toLowerCase().unsafeCast<String>()
 
 /**
  * Converts this character to upper case using Unicode mapping rules of the invariant locale.
@@ -57,8 +57,8 @@ public actual inline fun Char.toUpperCase(): Char = uppercaseChar()
  *
  * @sample samples.text.Chars.uppercase
  */
-@SinceKotlin("1.4")
-@ExperimentalStdlibApi
+@SinceKotlin("1.5")
+@WasExperimental(ExperimentalStdlibApi::class)
 public actual fun Char.uppercaseChar(): Char {
     val uppercase = uppercase()
     return if (uppercase.length > 1) this else uppercase[0]
@@ -74,10 +74,10 @@ public actual fun Char.uppercaseChar(): Char {
  *
  * @sample samples.text.Chars.uppercase
  */
-@SinceKotlin("1.4")
-@ExperimentalStdlibApi
+@SinceKotlin("1.5")
+@WasExperimental(ExperimentalStdlibApi::class)
 @kotlin.internal.InlineOnly
-public actual inline fun Char.uppercase(): String = toString().asDynamic().toUpperCase() as String
+public actual inline fun Char.uppercase(): String = toString().asDynamic().toUpperCase().unsafeCast<String>()
 
 /**
  * Converts this character to title case using Unicode mapping rules of the invariant locale.
@@ -89,7 +89,6 @@ public actual inline fun Char.uppercase(): String = toString().asDynamic().toUpp
  * @sample samples.text.Chars.titlecase
  */
 @SinceKotlin("1.5")
-@ExperimentalStdlibApi
 public actual fun Char.titlecaseChar(): Char = titlecaseCharImpl()
 
 /**

libraries/stdlib/js/src/kotlin/text/string.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -180,8 +180,8 @@ public actual inline fun String.toUpperCase(): String = asDynamic().toUpperCase(
  *
  * @sample samples.text.Strings.uppercase
  */
-@SinceKotlin("1.4")
-@ExperimentalStdlibApi
+@SinceKotlin("1.5")
+@WasExperimental(ExperimentalStdlibApi::class)
 @kotlin.internal.InlineOnly
 public actual inline fun String.uppercase(): String = asDynamic().toUpperCase()
 
@@ -199,8 +199,8 @@ public actual inline fun String.toLowerCase(): String = asDynamic().toLowerCase(
  *
  * @sample samples.text.Strings.lowercase
  */
-@SinceKotlin("1.4")
-@ExperimentalStdlibApi
+@SinceKotlin("1.5")
+@WasExperimental(ExperimentalStdlibApi::class)
 @kotlin.internal.InlineOnly
 public actual inline fun String.lowercase(): String = asDynamic().toLowerCase()