rename getSerializeNull to shouldSerializeNull

Serializer/AbstractVisitor.php

@@ -36,9 +36,9 @@ abstract class AbstractVisitor implements VisitorInterface
         $this->serializeNull = (bool) $serializeNull;
     }
 
-    public function getSerializeNull()
+    public function shouldSerializeNull()
     {
-        return (bool) $this->serializeNull;
+        return $this->serializeNull;
     }
 
     public function getNamingStrategy()

Serializer/GenericSerializationVisitor.php

@@ -97,7 +97,7 @@ abstract class GenericSerializationVisitor extends AbstractVisitor
         foreach ($data as $k => $v) {
             $v = $this->navigator->accept($v, isset($type['params'][1]) ? $type['params'][1] : null, $this);
 
-            if (null === $v && (!is_string($k) || !$this->getSerializeNull())) {
+            if (null === $v && (!is_string($k) || !$this->shouldSerializeNull())) {
                 continue;
             }
 
@@ -135,7 +135,7 @@ abstract class GenericSerializationVisitor extends AbstractVisitor
                 : $data->{$metadata->getter}());
 
         $v = $this->navigator->accept($v, $metadata->type, $this);
-        if (null === $v && !$this->getSerializeNull()) {
+        if (null === $v && !$this->shouldSerializeNull()) {
             return;
         }
 

Serializer/XmlSerializationVisitor.php

@@ -164,7 +164,7 @@ class XmlSerializationVisitor extends AbstractVisitor
         $v = (null === $metadata->getter ? $metadata->reflection->getValue($object)
             : $object->{$metadata->getter}());
 
-        if (null === $v && !$this->getSerializeNull()) {
+        if (null === $v && !$this->shouldSerializeNull()) {
             return;
         }
 

Serializer/YamlSerializationVisitor.php

@@ -85,7 +85,7 @@ class YamlSerializationVisitor extends AbstractVisitor
         $isList = array_keys($data) === range(0, count($data) - 1);
 
         foreach ($data as $k => $v) {
-            if (null === $v && (!is_string($k) || !$this->getSerializeNull())) {
+            if (null === $v && (!is_string($k) || !$this->shouldSerializeNull())) {
                 continue;
             }
 
@@ -157,7 +157,7 @@ class YamlSerializationVisitor extends AbstractVisitor
         $v = (null === $metadata->getter ? $metadata->reflection->getValue($data)
             : $data->{$metadata->getter}());
 
-        if (null === $v && !$this->getSerializeNull()) {
+        if (null === $v && !$this->shouldSerializeNull()) {
             return;
         }