Add test

Author: VincentLanglet

tests/PHPStan/Rules/Classes/InstantiationRuleTest.php

@@ -493,6 +493,11 @@ public function testPhpstanInternalClass(): void
 		]);
 	}
 
+	public function testBug9659(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-9659.php'], []);
+	}
+
 	public function testBug10248(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-10248.php'], []);

tests/PHPStan/Rules/Classes/data/bug-9659.php

@@ -0,0 +1,17 @@
+<?php // lint >=8.0
+
+namespace Bug9659;
+
+class HelloWorld
+{
+	/**
+	 * @param float|null $timeout
+	 */
+	public function __construct($timeout = null)
+	{
+		var_dump($timeout);
+	}
+}
+
+new HelloWorld(20); // working
+new HelloWorld(random_int(20, 80)); // broken