Merge pull request #3226 from BPplays/ipv6_auto

Automatically detect what IP versions are available and use them

src/util.js

@@ -692,6 +692,22 @@ export function isValidUrl(url) {
     }
 }
 
+export function urlHostnameToIPv6(hostname) {
+    if (hostname.startsWith('[')) {
+        hostname = hostname.slice(1);
+    }
+    if (hostname.endsWith(']')) {
+        hostname = hostname.slice(0, -1);
+    }
+    return hostname;
+}
+
+export function stringToBool(str) {
+    if (str === 'true') return true;
+    if (str === 'false') return false;
+    return str;
+}
+
 /**
  * MemoryLimitedMap class that limits the memory usage of string values.
  */