Fix return type of UConverter::fromUCallback() and UConverter::toUCallback()

Author: kocsismate

ext/intl/converter/converter.stub.php

@@ -11,7 +11,7 @@ public function convert(string $str, bool $reverse = false) {}
 
     /**
      * @param int $error
-     * @return string|null
+     * @return string|int|array|null
      */
     public function fromUCallback(int $reason, array $source, int $codePoint, &$error) {}
 
@@ -59,7 +59,7 @@ public function setSubstChars(string $chars) {}
 
     /**
      * @param int $error
-     * @return string|null
+     * @return string|int|array|null
      */
     public function toUCallback(int $reason, string $source, string $codeUnits, &$error) {}
 

ext/intl/converter/converter_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: e33e2614c969c59b79c6062f7a347a8e8e486d85 */
+ * Stub hash: 07a152ecebadf8f1766fb231cd60bfefda0dd6a6 */
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_UConverter___construct, 0, 0, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, destination_encoding, IS_STRING, 1, "null")