tweak: do not double unserialize in getInstance

Author: g105b

src/Cache.php

@@ -80,8 +80,7 @@ public function getArray(string $name, callable $callback, int $secondsValid = s
 	 * @return T
 	 */
 	public function getInstance(string $name, string $className, callable $callback, int $secondsValid = self::DEFAULT_SECONDS_VALID):object {
-		$serialized = $this->get($name, $callback, $secondsValid);
-		$value = unserialize($serialized);
+		$value = $this->get($name, $callback, $secondsValid);
 		if(get_class($value) !== $className) {
 			throw new TypeError("Value is not of type $className");
 		}

test/phpunit/CacheTest.php

@@ -91,7 +91,7 @@ public function testGetInstance():void {
 		$value->name = uniqid();
 
 		$sut = $this->getSut([
-			"test" => serialize($value),
+			"test" => $value,
 		]);
 		$class = $sut->getInstance("test", StdClass::class, fn() => false);
 		self::assertSame($value->name, $class->name);