From c496d8ed5025d169cdd0b87043c574c7789a5cb9 Mon Sep 17 00:00:00 2001
From: Roman Artemev <roman.artemev@jetbrains.com>
Date: Thu, 18 Oct 2018 15:13:09 +0300
Subject: [PATCH] Fix Char.toLowerCase/Char.toUpperCase extensions

---
 libraries/stdlib/js/src/kotlin/char.kt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libraries/stdlib/js/src/kotlin/char.kt b/libraries/stdlib/js/src/kotlin/char.kt
index bee6c5d0214..37c302f3861 100644
--- a/libraries/stdlib/js/src/kotlin/char.kt
+++ b/libraries/stdlib/js/src/kotlin/char.kt
@@ -9,10 +9,10 @@ package kotlin.text
 public actual fun Char.isWhitespace(): Boolean = toString().matches("[\\s\\xA0]")
 
 @kotlin.internal.InlineOnly
-public actual inline fun Char.toLowerCase(): Char = js("String.fromCharCode")(this).toLowerCase().charCodeAt(0)
+public actual inline fun Char.toLowerCase(): Char = js("String.fromCharCode")(toInt()).toLowerCase().charCodeAt(0).unsafeCast<Int>().toChar()
 
 @kotlin.internal.InlineOnly
-public actual inline fun Char.toUpperCase(): Char = js("String.fromCharCode")(this).toUpperCase().charCodeAt(0)
+public actual inline fun Char.toUpperCase(): Char = js("String.fromCharCode")(toInt()).toUpperCase().charCodeAt(0).unsafeCast<Int>().toChar()
 
 /**
  * Returns `true` if this character is a Unicode high-surrogate code unit (also known as leading-surrogate code unit).