Added regression test

Author: staabm

tests/PHPStan/Rules/InternalTag/RestrictedInternalStaticMethodUsageExtensionTest.php

@@ -76,4 +76,9 @@ public function testNoNamespace(): void
 		]);
 	}
 
+	public function testBug13210(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-13210.php'], []);
+	}
+
 }

tests/PHPStan/Rules/InternalTag/data/bug-13210.php

@@ -0,0 +1,20 @@
+<?php
+
+/**
+ * @internal
+ *
+ * @readonly
+ */
+final class DBInternal
+{
+	public static function phpValueToSql(int|string|BackedEnum|null $phpValue): string
+	{
+		return match (true) {
+			$phpValue === null => 'NULL',
+			is_string($phpValue) => "''",
+			is_int($phpValue) => (string)$phpValue,
+			$phpValue instanceof BackedEnum => self::phpValueToSql($phpValue->value),
+		};
+	}
+
+}