Different escaping. No unescape called. Escapes into UTF-8 range (only escape 0x00-0x1f, double quote and backslash, and 0x7f-0x9f, the rest is left unchanged).

st/Kernel-Collections.st

@@ -976,7 +976,7 @@ asJavaScriptSelector
 asJavascript
 	<
 		if(self.search(/^[a-zA-Z0-9_:.$ ]*$/) == -1)
-			return "unescape(\"" + escape(self) + "\")";
+			return "\"" + self.replace(/[\x00-\x1f"\\\x7f-\x9f]/g, function(ch){var c=ch.charCodeAt(0);return "\\x"+("0"+c.toString(16)).slice(-2)}) + "\"";
 		else
 			return "\"" + self + "\"";
 	>