diff --git a/src/Symfony/Component/Serializer/Encoder/ChainDecoder.php b/src/Symfony/Component/Serializer/Encoder/ChainDecoder.php
index a4cc9f67957ea..930c419552d74 100644
--- a/src/Symfony/Component/Serializer/Encoder/ChainDecoder.php
+++ b/src/Symfony/Component/Serializer/Encoder/ChainDecoder.php
@@ -22,7 +22,7 @@
  *
  * @final since version 3.3.
  */
-class ChainDecoder implements DecoderInterface /*, ContextAwareDecoderInterface*/
+class ChainDecoder implements ContextAwareDecoderInterface
 {
     protected $decoders = array();
     protected $decoderByFormat = array();
@@ -43,10 +43,8 @@ final public function decode($data, $format, array $context = array())
     /**
      * {@inheritdoc}
      */
-    public function supportsDecoding($format/*, array $context = array()*/)
+    public function supportsDecoding($format, array $context = array())
     {
-        $context = func_num_args() > 1 ? func_get_arg(1) : array();
-
         try {
             $this->getDecoder($format, $context);
         } catch (RuntimeException $e) {
diff --git a/src/Symfony/Component/Serializer/Encoder/ChainEncoder.php b/src/Symfony/Component/Serializer/Encoder/ChainEncoder.php
index cfd8855bb8150..ae12cc9f29166 100644
--- a/src/Symfony/Component/Serializer/Encoder/ChainEncoder.php
+++ b/src/Symfony/Component/Serializer/Encoder/ChainEncoder.php
@@ -22,7 +22,7 @@
  *
  * @final since version 3.3.
  */
-class ChainEncoder implements EncoderInterface /*, ContextAwareEncoderInterface*/
+class ChainEncoder implements ContextAwareEncoderInterface
 {
     protected $encoders = array();
     protected $encoderByFormat = array();
@@ -43,10 +43,8 @@ final public function encode($data, $format, array $context = array())
     /**
      * {@inheritdoc}
      */
-    public function supportsEncoding($format/*, array $context = array()*/)
+    public function supportsEncoding($format, array $context = array())
     {
-        $context = func_num_args() > 1 ? func_get_arg(1) : array();
-
         try {
             $this->getEncoder($format, $context);
         } catch (RuntimeException $e) {
@@ -64,9 +62,8 @@ public function supportsEncoding($format/*, array $context = array()*/)
      *
      * @return bool
      */
-    public function needsNormalization($format/*, array $context = array()*/)
+    public function needsNormalization($format, array $context = array())
     {
-        $context = func_num_args() > 1 ? func_get_arg(1) : array();
         $encoder = $this->getEncoder($format, $context);
 
         if (!$encoder instanceof NormalizationAwareInterface) {
diff --git a/src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php b/src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php
index 56d27eb7bf20f..817fe5111a9c5 100644
--- a/src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php
@@ -24,7 +24,7 @@
  *
  * @final since version 3.3.
  */
-class ArrayDenormalizer implements DenormalizerInterface, SerializerAwareInterface
+class ArrayDenormalizer implements ContextAwareDenormalizerInterface, SerializerAwareInterface
 {
     /**
      * @var SerializerInterface|DenormalizerInterface
@@ -66,10 +66,8 @@ public function denormalize($data, $class, $format = null, array $context = arra
     /**
      * {@inheritdoc}
      */
-    public function supportsDenormalization($data, $type, $format = null/*, array $context = array()*/)
+    public function supportsDenormalization($data, $type, $format = null, array $context = array())
     {
-        $context = func_num_args() > 3 ? func_get_arg(3) : array();
-
         return substr($type, -2) === '[]'
             && $this->serializer->supportsDenormalization($data, substr($type, 0, -2), $format, $context);
     }
diff --git a/src/Symfony/Component/Serializer/Serializer.php b/src/Symfony/Component/Serializer/Serializer.php
index f63c7d5c88e62..0911c67108d64 100644
--- a/src/Symfony/Component/Serializer/Serializer.php
+++ b/src/Symfony/Component/Serializer/Serializer.php
@@ -13,8 +13,12 @@
 
 use Symfony\Component\Serializer\Encoder\ChainDecoder;
 use Symfony\Component\Serializer\Encoder\ChainEncoder;
+use Symfony\Component\Serializer\Encoder\ContextAwareDecoderInterface;
+use Symfony\Component\Serializer\Encoder\ContextAwareEncoderInterface;
 use Symfony\Component\Serializer\Encoder\EncoderInterface;
 use Symfony\Component\Serializer\Encoder\DecoderInterface;
+use Symfony\Component\Serializer\Normalizer\ContextAwareDenormalizerInterface;
+use Symfony\Component\Serializer\Normalizer\ContextAwareNormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizerAwareInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerAwareInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
@@ -37,7 +41,7 @@
  * @author Lukas Kahwe Smith <smith@pooteeweet.org>
  * @author Kévin Dunglas <dunglas@gmail.com>
  */
-class Serializer implements SerializerInterface, NormalizerInterface, DenormalizerInterface, EncoderInterface, DecoderInterface
+class Serializer implements SerializerInterface, ContextAwareNormalizerInterface, ContextAwareDenormalizerInterface, ContextAwareEncoderInterface, ContextAwareDecoderInterface
 {
     /**
      * @var Encoder\ChainEncoder

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