Merge branch '6.4' into 7.2

* 6.4:
  [Routing] Add test to validate that default value is allowed to not match requirement
  fix handling required options
  Fix @var phpdoc
  [Lock] [MongoDB] Enforce readPreference=primary and writeConcern=majority
  [FrameworkBundle] fix phpdoc in `MicroKernelTrait`
  Fixed validator translations for Albanian

Author: nicolas-grekas

Tests/Matcher/UrlMatcherTest.php

@@ -1000,6 +1000,30 @@ public function testUtf8VarName()
         $this->assertEquals(['_route' => 'foo', 'bär' => 'baz', 'bäz' => 'foo'], $matcher->match('/foo/baz'));
     }
 
+    public function testParameterWithRequirementWithDefault()
+    {
+        $collection = new RouteCollection();
+
+        $route = new Route('/test/{foo}', ['foo' => 'foo-'], ['foo' => '\w+']);
+        $collection->add('test', $route);
+
+        $matcher = $this->getUrlMatcher($collection);
+
+        $result = $matcher->match('/test/foo');
+        $this->assertSame('test', $result['_route']);
+        $this->assertSame('foo', $result['foo']);
+
+        try {
+            $matcher->match('/test/foo-');
+        } catch (ResourceNotFoundException $e) {
+            $this->assertStringContainsString('No routes found', $e->getMessage());
+        }
+
+        $result = $matcher->match('/test');
+        $this->assertSame('test', $result['_route']);
+        $this->assertSame('foo-', $result['foo']);
+    }
+
     public function testMapping()
     {
         $collection = new RouteCollection();