Merge branch '6.4' into 7.0

* 6.4:
  More short closures + isset instead of null checks + etc.

Crawler.php

@@ -1084,7 +1084,7 @@ private function parseXhtml(string $htmlContent, string $charset = 'UTF-8'): \DO
      */
     private function convertToHtmlEntities(string $htmlContent, string $charset = 'UTF-8'): string
     {
-        set_error_handler(function () { throw new \Exception(); });
+        set_error_handler(static fn () => throw new \Exception());
 
         try {
             return mb_encode_numericentity($htmlContent, [0x80, 0x10FFFF, 0, 0x1FFFFF], $charset);