Fixed serialization test

src/Parser/RegexParser.php

@@ -139,6 +139,7 @@ private function extractValue($value)
      */
     private function isDelimitedValue($value)
     {
+        /** @psalm-suppress ArgumentTypeCoercion */
         return strlen($value) >= 2 * $this->parameterValueDelimiterLength
             && 0 === strncmp($value, $this->parameterValueDelimiter, $this->parameterValueDelimiterLength)
             && substr($value, -1 * $this->parameterValueDelimiterLength) === $this->parameterValueDelimiter;

tests/FacadeTest.php

@@ -1,6 +1,7 @@
 <?php
 namespace Thunder\Shortcode\Tests;
 
+use Composer\InstalledVersions;
 use Thunder\Shortcode\EventHandler\FilterRawEventHandler;
 use Thunder\Shortcode\Events;
 use Thunder\Shortcode\HandlerContainer\HandlerContainer;
@@ -66,7 +67,15 @@ public function testSerialization()
 bbCode: null
 
 EOF;
-        $this->assertSame($yaml, $facade->serialize($s, 'yaml'));
+        $yaml8 = <<<EOF
+name: c
+parameters: {}
+content: null
+bbCode: null
+
+EOF;
+        $symfonyYamlVersion = InstalledVersions::getVersion('symfony/yaml');
+        $this->assertSame(preg_match('~\A8~', $symfonyYamlVersion) ? $yaml8 : $yaml, $facade->serialize($s, 'yaml'));
         $this->assertSame('c', $facade->unserialize($yaml, 'yaml')->getName());
 
         $xml = <<<EOF