Merge branch '3.4' into 4.1

* 3.4:
  skip native serialize among child and parent serializable objects
  [Routing] backport tests from 4.1
  Add PackageNameTest to ConfigurationTest also add in the changelog the corresponding entry to this PR
  Support use of hyphen in asset package name
  Remove gendered pronouns
  Replace gender by eye color in tests
  [Security] dont do nested calls to serialize()

Author: nicolas-grekas

FormRenderer.php

@@ -160,9 +160,9 @@ public function searchAndRenderBlock(FormView $view, $blockNameSuffix, array $va
         // to implement a custom "choice_widget" block (no matter in which theme),
         // or to fallback to the block of the parent type, which would be
         // "form_widget" in this example (again, no matter in which theme).
-        // If the designer wants to explicitly fallback to "form_widget" in his
-        // custom "choice_widget", for example because he only wants to wrap
-        // a <div> around the original implementation, he can simply call the
+        // If the designer wants to explicitly fallback to "form_widget" in their
+        // custom "choice_widget", for example because they only want to wrap
+        // a <div> around the original implementation, they can simply call the
         // widget() function again to render the block for the parent type.
         //
         // The second kind is implemented in the following blocks.

Tests/AbstractTableLayoutTest.php

@@ -470,7 +470,7 @@ public function testFormEndWithRest()
         // Insert the start tag, the end tag should be rendered by the helper
         // Unfortunately this is not valid HTML, because the surrounding table
         // tag is missing. If someone renders a form with table layout
-        // manually, she should call form_rest() explicitly within the <table>
+        // manually, they should call form_rest() explicitly within the <table>
         // tag.
         $this->assertMatchesXpath('<form>'.$html,
 '/form