Merge branch '4.0'

* 4.0:
  [YAML] Issue #26065: leading spaces in YAML multi-line string literals
  [Bridge\PhpUnit] Exit as late as possible
  [Bridge\PhpUnit] Cleanup BC layer
  [PhpBridge] add PHPUnit 7 support to SymfonyTestsListener
  [Lock] Log already-locked errors as "notice" instead of "warning"
  add context to serialize and deserialize
  Update Repository Symlink Helper
  isCsrfTokenValid() replace string  by ?string
  Document explicitly that dotfiles and vcs files are ignored by default
  [HttpKernel] don't try to wire Request argument with controller.service_arguments
  Make kernel build time optionally deterministic
  Use 0 for unlimited expiry
  [Routing] fix typo
  Bump default PHPUnit version from 6.3 to 6.5
  do not mock the container builder in tests
  [Cache][WebProfiler] fix collecting cache stats with sub-requests + allow clearing calls

Author: nicolas-grekas

CHANGELOG.md

@@ -30,6 +30,7 @@ CHANGELOG
  * added getter for extra attributes in `ExtraAttributesException`
  * improved `CsvEncoder` to handle variable nested structures
  * CSV headers can be passed to the `CsvEncoder` via the `csv_headers` serialization context variable 
+ * added `$context` when checking for encoding, decoding and normalizing in `Serializer`
 
 3.3.0
 -----

Serializer.php

@@ -98,11 +98,11 @@ public function __construct(array $normalizers = array(), array $encoders = arra
      */
     final public function serialize($data, $format, array $context = array())
     {
-        if (!$this->supportsEncoding($format)) {
+        if (!$this->supportsEncoding($format, $context)) {
             throw new NotEncodableValueException(sprintf('Serialization for the format %s is not supported', $format));
         }
 
-        if ($this->encoder->needsNormalization($format)) {
+        if ($this->encoder->needsNormalization($format, $context)) {
             $data = $this->normalize($data, $format, $context);
         }
 
@@ -114,7 +114,7 @@ final public function serialize($data, $format, array $context = array())
      */
     final public function deserialize($data, $type, $format, array $context = array())
     {
-        if (!$this->supportsDecoding($format)) {
+        if (!$this->supportsDecoding($format, $context)) {
             throw new NotEncodableValueException(sprintf('Deserialization for the format %s is not supported', $format));
         }