Merge branch '5.4' into 6.0

* 5.4:
  Fix some redundant @return phpdoc
  [Dotenv][Runtime] Add $overrideExistingVars to bootEnv() and loadEnv() and dotenv_overload to SymfonyRuntime
  Add check and tests for public properties
  [BrowserKit][HttpClient][Routing] support building query strings with stringables

Author: xabbuh

HttpClientTrait.php

@@ -291,7 +291,18 @@ private static function normalizeHeaders(array $headers): array
     private static function normalizeBody($body)
     {
         if (\is_array($body)) {
-            return http_build_query($body, '', '&', \PHP_QUERY_RFC1738);
+            array_walk_recursive($body, $caster = static function (&$v) use (&$caster) {
+                if (\is_object($v)) {
+                    if ($vars = get_object_vars($v)) {
+                        array_walk_recursive($vars, $caster);
+                        $v = $vars;
+                    } elseif (method_exists($v, '__toString')) {
+                        $v = (string) $v;
+                    }
+                }
+            });
+
+            return http_build_query($body, '', '&');
         }
 
         if (\is_string($body)) {

Tests/MockHttpClientTest.php

@@ -400,4 +400,22 @@ public function testChangeResponseFactory()
 
         $this->assertSame($expectedBody, $response->getContent());
     }
+
+    public function testStringableBodyParam()
+    {
+        $client = new MockHttpClient();
+
+        $param = new class() {
+            public function __toString()
+            {
+                return 'bar';
+            }
+        };
+
+        $response = $client->request('GET', 'https://example.com', [
+            'body' => ['foo' => $param],
+        ]);
+
+        $this->assertSame('foo=bar', $response->getRequestOptions()['body']);
+    }
 }