Merge branch '3.4' into 4.1

* 3.4:
  Command::addOption should allow int in $default
  [Form] Fixed keeping hash of equal \DateTimeInterface on submit
  [PhpUnitBridge] Fix typo
  [Form] Minor fixes in docs and cs
  [Config] Unset key during normalization
  [Form] Fixed empty data for compound date types
  invalidate forms on transformation failures
  [PropertyAccessor] Fix unable to write to singular property using setter while plural adder/remover exist

Author: nicolas-grekas

Command/Command.php

@@ -379,11 +379,11 @@ public function addArgument($name, $mode = null, $description = '', $default = n
     /**
      * Adds an option.
      *
-     * @param string                    $name        The option name
-     * @param string|array              $shortcut    The shortcuts, can be null, a string of shortcuts delimited by | or an array of shortcuts
-     * @param int|null                  $mode        The option mode: One of the VALUE_* constants
-     * @param string                    $description A description text
-     * @param string|string[]|bool|null $default     The default value (must be null for self::VALUE_NONE)
+     * @param string                        $name        The option name
+     * @param string|array                  $shortcut    The shortcuts, can be null, a string of shortcuts delimited by | or an array of shortcuts
+     * @param int|null                      $mode        The option mode: One of the VALUE_* constants
+     * @param string                        $description A description text
+     * @param string|string[]|int|bool|null $default     The default value (must be null for self::VALUE_NONE)
      *
      * @throws InvalidArgumentException If option mode is invalid or incompatible
      *