Revert "used generics (#261)" [Closes #274]

This reverts commit 927cf12.

src/DI/Container.php

@@ -232,9 +232,7 @@ public function createService(string $name, array $args = [])
 
 	/**
 	 * Resolves service by type.
-	 * @template T
-	 * @param  class-string<T>  $type
-	 * @return ?T
+	 * @return object|null  service
 	 * @throws MissingServiceException
 	 */
 	public function getByType(string $type, bool $throw = true)

tests/DI/ContainerBuilder.resolve.Container.phpt

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * Test: Nette\DI\Container::getByType() can be resolved
+ */
+
+declare(strict_types=1);
+
+use Nette\DI;
+use Tester\Assert;
+
+require __DIR__ . '/../bootstrap.php';
+
+
+class Lorem
+{
+	public function next(): stdClass
+	{
+		return new stdClass;
+	}
+}
+
+
+$container = createContainer(new DI\Compiler, '
+services:
+	lorem: Lorem
+
+	next:
+		factory: @container::getByType(Lorem)::next()
+		type: stdClass
+');
+
+
+Assert::type(stdClass::class, $container->getService('next'));