Merge branch '6.1' into 6.2

* 6.1:
  fix typo in PULL_REQUEST_TEMPLATE.md
  Allow to disable lock without defining a resource
  [HttpFoundation] Compare cookie with null value as empty string in ResponseCookieValueSame
  Fix deprecation notice when date argument is not nullable and null value is provided

Author: derrabus

Test/Constraint/ResponseCookieValueSame.php

@@ -54,7 +54,7 @@ protected function matches($response): bool
             return false;
         }
 
-        return $this->value === $cookie->getValue();
+        return $this->value === (string) $cookie->getValue();
     }
 
     /**

Tests/Test/Constraint/ResponseCookieValueSameTest.php

@@ -41,4 +41,12 @@ public function testConstraint()
 
         $this->fail();
     }
+
+    public function testCookieWithNullValueIsComparedAsEmptyString()
+    {
+        $response = new Response();
+        $response->headers->setCookie(Cookie::create('foo', null, 0, '/path'));
+
+        $this->assertTrue((new ResponseCookieValueSame('foo', '', '/path'))->evaluate($response, '', true));
+    }
 }