diff --git a/core/lib/Drupal/Core/Config/Schema/ArrayElement.php b/core/lib/Drupal/Core/Config/Schema/ArrayElement.php
index ae96d2d6e1..b38a94b3c2 100644
--- a/core/lib/Drupal/Core/Config/Schema/ArrayElement.php
+++ b/core/lib/Drupal/Core/Config/Schema/ArrayElement.php
@@ -3,15 +3,12 @@
 namespace Drupal\Core\Config\Schema;
 
 use Drupal\Core\TypedData\ComplexDataInterface;
-use Drupal\Core\TypedData\ComplexDataWithExposedPropertiesTrait;
 
 /**
  * Defines a generic configuration element that contains multiple properties.
  */
 abstract class ArrayElement extends Element implements \IteratorAggregate, TypedConfigInterface, ComplexDataInterface {
 
-  use ComplexDataWithExposedPropertiesTrait;
-
   /**
    * Parsed elements.
    */
diff --git a/core/lib/Drupal/Core/Entity/Plugin/DataType/EntityAdapter.php b/core/lib/Drupal/Core/Entity/Plugin/DataType/EntityAdapter.php
index 311f4080e2..4e81796dc3 100644
--- a/core/lib/Drupal/Core/Entity/Plugin/DataType/EntityAdapter.php
+++ b/core/lib/Drupal/Core/Entity/Plugin/DataType/EntityAdapter.php
@@ -6,7 +6,6 @@
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\TypedData\EntityDataDefinition;
 use Drupal\Core\TypedData\ComplexDataInterface;
-use Drupal\Core\TypedData\ComplexDataWithExposedPropertiesTrait;
 use Drupal\Core\TypedData\Exception\MissingDataException;
 use Drupal\Core\TypedData\TypedData;
 
@@ -28,8 +27,6 @@
  * )
  */
 class EntityAdapter extends TypedData implements \IteratorAggregate, ComplexDataInterface {
-
-  use ComplexDataWithExposedPropertiesTrait;
   /**
    * The wrapped entity object.
    *
diff --git a/core/lib/Drupal/Core/TypedData/ComplexDataInterface.php b/core/lib/Drupal/Core/TypedData/ComplexDataInterface.php
index 5b6b58b4a4..6396cb8f51 100644
--- a/core/lib/Drupal/Core/TypedData/ComplexDataInterface.php
+++ b/core/lib/Drupal/Core/TypedData/ComplexDataInterface.php
@@ -102,12 +102,4 @@ public function toArray();
    */
   public function isEmpty();
 
-  /**
-   * Gets an array of property objects for exposed properties.
-   *
-   * @return \Drupal\Core\TypedData\TypedDataInterface[]
-   *   The exposed properties.
-   */
-  public function getExposedProperties();
-
 }
diff --git a/core/lib/Drupal/Core/TypedData/ComplexDataWithExposedPropertiesTrait.php b/core/lib/Drupal/Core/TypedData/ComplexDataWithExposedPropertiesTrait.php
deleted file mode 100644
index 69e3d61a50..0000000000
--- a/core/lib/Drupal/Core/TypedData/ComplexDataWithExposedPropertiesTrait.php
+++ /dev/null
@@ -1,27 +0,0 @@
-<?php
-
-namespace Drupal\Core\TypedData;
-
-/**
- * Common functions for complex data types that may have exposed properties.
- */
-trait ComplexDataWithExposedPropertiesTrait {
-
-  /**
-   * {@inheritdoc}
-   *
-   * Implements getExposedProperties() for
-   * \Drupal\Core\TypedData\ComplexDataInterface.
-   */
-  public function getExposedProperties() {
-    $properties = $this->getProperties(TRUE);
-    /* @var  \Drupal\Core\TypedData\TypedDataInterface[] $properties */
-    foreach (array_keys($properties) as $property_name) {
-      if (!$properties[$property_name]->getDataDefinition()->isExposed()) {
-        unset($properties[$property_name]);
-      }
-    }
-    return $properties;
-  }
-
-}
diff --git a/core/lib/Drupal/Core/TypedData/DataDefinitionInterface.php b/core/lib/Drupal/Core/TypedData/DataDefinitionInterface.php
index afaf4f441f..7ea68e47e6 100644
--- a/core/lib/Drupal/Core/TypedData/DataDefinitionInterface.php
+++ b/core/lib/Drupal/Core/TypedData/DataDefinitionInterface.php
@@ -227,7 +227,7 @@ public function addConstraint($constraint_name, $options = NULL);
    * @return static
    *   The object itself for chaining.
    */
-  public function setExposed($exposed);
+  public function setExposed($exposed = TRUE);
 
   /**
    * Determines whether the data value is exposed.
diff --git a/core/lib/Drupal/Core/TypedData/ExposableDataDefinitionTrait.php b/core/lib/Drupal/Core/TypedData/ExposableDataDefinitionTrait.php
index 708e40f3a9..ba47fe35c7 100644
--- a/core/lib/Drupal/Core/TypedData/ExposableDataDefinitionTrait.php
+++ b/core/lib/Drupal/Core/TypedData/ExposableDataDefinitionTrait.php
@@ -26,7 +26,7 @@ public function isExposed() {
    *
    * Implements setExposed() for \Drupal\Core\TypedData\DataDefinitionInterface.
    */
-  public function setExposed($exposed) {
+  public function setExposed($exposed = TRUE) {
     $this->definition['exposed'] = $exposed;
     return $this;
   }
diff --git a/core/lib/Drupal/Core/TypedData/Plugin/DataType/Map.php b/core/lib/Drupal/Core/TypedData/Plugin/DataType/Map.php
index a3b2657c9f..a95c14b30e 100644
--- a/core/lib/Drupal/Core/TypedData/Plugin/DataType/Map.php
+++ b/core/lib/Drupal/Core/TypedData/Plugin/DataType/Map.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\Core\TypedData\Plugin\DataType;
 
-use Drupal\Core\TypedData\ComplexDataWithExposedPropertiesTrait;
 use Drupal\Core\TypedData\TypedData;
 use Drupal\Core\TypedData\ComplexDataInterface;
 
@@ -27,8 +26,6 @@
  */
 class Map extends TypedData implements \IteratorAggregate, ComplexDataInterface {
 
-  use ComplexDataWithExposedPropertiesTrait;
-
   /**
    * The data definition.
    *
diff --git a/core/lib/Drupal/Core/TypedData/TypedDataHelper.php b/core/lib/Drupal/Core/TypedData/TypedDataHelper.php
new file mode 100644
index 0000000000..1df10eb252
--- /dev/null
+++ b/core/lib/Drupal/Core/TypedData/TypedDataHelper.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Drupal\Core\TypedData;
+
+/**
+ * Helper class for Typed Data.
+ *
+ * @ingroup typed_data
+ */
+class TypedDataHelper {
+
+  /**
+   * Gets an array exposed properties from a complex data object.
+   *
+   * @param \Drupal\Core\TypedData\ComplexDataInterface $data
+   *   The complex data object.
+   *
+   * @return \Drupal\Core\TypedData\TypedDataInterface[]
+   *   The exposed properties.
+   */
+  public static function getExposedProperties(ComplexDataInterface $data) {
+    return array_filter($data->getProperties(TRUE), function (TypedDataInterface $property) {
+      return $property->getDataDefinition()->isExposed();
+    });
+  }
+
+}
diff --git a/core/modules/path/tests/src/Kernel/PathItemTest.php b/core/modules/path/tests/src/Kernel/PathItemTest.php
index 9a85a27958..1c7eb28ae0 100644
--- a/core/modules/path/tests/src/Kernel/PathItemTest.php
+++ b/core/modules/path/tests/src/Kernel/PathItemTest.php
@@ -66,10 +66,18 @@ public function testPathItem() {
 
     $node_storage->resetCache();
 
+    // Ensure that isEmpty(), ->alias, and [0]->get('alias')->getValue() can all
+    // be called individually without the other methods being called.
+    // @see \Drupal\path\Plugin\Field\FieldType\PathItem::ensureLoaded()
     /** @var \Drupal\node\NodeInterface $loaded_node */
     $loaded_node = $node_storage->load($node->id());
     $this->assertFalse($loaded_node->get('path')->isEmpty());
+    $node_storage->resetCache();
+    $loaded_node = $node_storage->load($node->id());
     $this->assertEquals('/foo', $loaded_node->get('path')->alias);
+    $node_storage->resetCache();
+    $loaded_node = $node_storage->load($node->id());
+    $this->assertEquals('/foo', $loaded_node->get('path')[0]->get('alias')->getValue());
 
     $node_storage->resetCache();
     $loaded_node = $node_storage->load($node->id());
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityTest/EntityTestExposedPropertyNormalizerTest.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityTest/EntityTestExposedPropertyNormalizerTest.php
index 27729afa82..5a7df055e7 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityTest/EntityTestExposedPropertyNormalizerTest.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityTest/EntityTestExposedPropertyNormalizerTest.php
@@ -10,8 +10,6 @@
 /**
  * Test that exposed properties are actually exposed in REST.
  *
- * @see \Drupal\Core\TypedData\ComplexDataWithExposedPropertiesTrait
- *
  * @group rest
  */
 class EntityTestExposedPropertyNormalizerTest extends EntityTestResourceTestBase {
diff --git a/core/modules/serialization/src/Normalizer/ComplexDataPropertiesNormalizerTrait.php b/core/modules/serialization/src/Normalizer/ComplexDataPropertiesNormalizerTrait.php
index 0969629faf..8697d1ff29 100644
--- a/core/modules/serialization/src/Normalizer/ComplexDataPropertiesNormalizerTrait.php
+++ b/core/modules/serialization/src/Normalizer/ComplexDataPropertiesNormalizerTrait.php
@@ -4,6 +4,7 @@
 
 use Drupal\Core\Cache\CacheableDependencyInterface;
 use Drupal\Core\TypedData\ComplexDataInterface;
+use Drupal\Core\TypedData\TypedDataHelper;
 
 /**
  * Normalization methods for complex data properties.
@@ -25,7 +26,7 @@
    */
   protected function normalizeProperties(ComplexDataInterface $data, $format, array $context) {
     $attributes = [];
-    foreach ($data->getExposedProperties() as $name => $property) {
+    foreach (TypedDataHelper::getExposedProperties($data) as $name => $property) {
       $attribute = $this->serializer->normalize($property, $format, $context);
       if ($attribute instanceof CacheableDependencyInterface && isset($context['cacheability'])) {
         $context['cacheability']->addCacheableDependency($attribute);
diff --git a/core/modules/serialization/tests/src/Unit/Normalizer/ComplexDataNormalizerTest.php b/core/modules/serialization/tests/src/Unit/Normalizer/ComplexDataNormalizerTest.php
index de936d7acf..5ca4726660 100644
--- a/core/modules/serialization/tests/src/Unit/Normalizer/ComplexDataNormalizerTest.php
+++ b/core/modules/serialization/tests/src/Unit/Normalizer/ComplexDataNormalizerTest.php
@@ -10,6 +10,7 @@
 use Drupal\Core\Cache\CacheableDependencyInterface;
 use Drupal\Core\Cache\RefinableCacheableDependencyInterface;
 use Drupal\Core\TypedData\ComplexDataInterface;
+use Drupal\Core\TypedData\DataDefinitionInterface;
 use Drupal\Core\TypedData\TypedDataInterface;
 use Drupal\serialization\Normalizer\ComplexDataNormalizer;
 use Drupal\Tests\UnitTestCase;
@@ -21,6 +22,8 @@
  */
 class ComplexDataNormalizerTest extends UnitTestCase {
 
+  use TypedDataTestTrait;
+
   /**
    * Test format string.
    *
@@ -66,8 +69,9 @@ public function testNormalizeComplexData() {
       ->shouldBeCalled();
     $cacheable = $cacheable->reveal();
 
-    $property = $this->prophesize(TypedDataInterface::class);
-    $property = $property->reveal();
+    $exposed_cacheable_property = $this->getTypedDataProperty();
+    $exposed_noncacheable_property = $this->getTypedDataProperty();
+
 
     $cacheableMetaData = $this->prophesize(RefinableCacheableDependencyInterface::class);
     $cacheableMetaData->addCacheableDependency($cacheable)
@@ -76,18 +80,22 @@ public function testNormalizeComplexData() {
       'cacheability' => $cacheableMetaData->reveal(),
     ];
 
-    $serializer_prophecy->normalize('A', static::TEST_FORMAT, $serialization_context)
+    $serializer_prophecy->normalize($exposed_noncacheable_property, static::TEST_FORMAT, $serialization_context)
       ->willReturn('A-normalized')
       ->shouldBeCalled();
-    $serializer_prophecy->normalize($property, static::TEST_FORMAT, $serialization_context)
+    $serializer_prophecy->normalize($exposed_cacheable_property, static::TEST_FORMAT, $serialization_context)
       ->willReturn($cacheable)
       ->shouldBeCalled();
 
     $this->normalizer->setSerializer($serializer_prophecy->reveal());
 
     $complex_data = $this->prophesize(ComplexDataInterface::class);
-    $complex_data->getExposedProperties()
-      ->willReturn(['prop:a' => 'A', 'prop:cacheable' => $property])
+    $complex_data->getProperties(TRUE)
+      ->willReturn([
+        'prop:a' => $exposed_noncacheable_property,
+        'prop:cacheable' => $exposed_cacheable_property,
+        'prop:nonexposed' => $this->getTypedDataProperty(FALSE),
+      ])
       ->shouldBeCalled();
 
     $normalized = $this->normalizer->normalize($complex_data->reveal(), static::TEST_FORMAT, $serialization_context);
diff --git a/core/modules/serialization/tests/src/Unit/Normalizer/EntityReferenceFieldItemNormalizerTest.php b/core/modules/serialization/tests/src/Unit/Normalizer/EntityReferenceFieldItemNormalizerTest.php
index a107250865..b9a4f361ba 100644
--- a/core/modules/serialization/tests/src/Unit/Normalizer/EntityReferenceFieldItemNormalizerTest.php
+++ b/core/modules/serialization/tests/src/Unit/Normalizer/EntityReferenceFieldItemNormalizerTest.php
@@ -4,6 +4,7 @@
 
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\TypedData\DataDefinitionInterface;
 use Drupal\Core\TypedData\Plugin\DataType\StringData;
 use Drupal\Core\TypedData\Type\StringInterface;
 use Drupal\Core\TypedData\TypedDataInterface;
@@ -25,6 +26,8 @@
  */
 class EntityReferenceFieldItemNormalizerTest extends UnitTestCase {
 
+  use TypedDataTestTrait;
+
   /**
    * The mock serializer.
    *
@@ -124,8 +127,8 @@ public function testNormalize() {
       ->willReturn($entity_reference)
       ->shouldBeCalled();
 
-    $this->fieldItem->getExposedProperties()
-      ->willReturn(['target_id' => NULL])
+    $this->fieldItem->getProperties(TRUE)
+      ->willReturn(['target_id' => $this->getTypedDataProperty()])
       ->shouldBeCalled();
 
     $normalized = $this->normalizer->normalize($this->fieldItem->reveal());
@@ -152,8 +155,8 @@ public function testNormalizeWithNoEntity() {
       ->willReturn($entity_reference->reveal())
       ->shouldBeCalled();
 
-    $this->fieldItem->getExposedProperties()
-      ->willReturn(['target_id' => NULL])
+    $this->fieldItem->getProperties(TRUE)
+      ->willReturn(['target_id' => $this->getTypedDataProperty()])
       ->shouldBeCalled();
 
     $normalized = $this->normalizer->normalize($this->fieldItem->reveal());
diff --git a/core/modules/serialization/tests/src/Unit/Normalizer/TimestampItemNormalizerTest.php b/core/modules/serialization/tests/src/Unit/Normalizer/TimestampItemNormalizerTest.php
index 0db0ca71a5..47fead15d2 100644
--- a/core/modules/serialization/tests/src/Unit/Normalizer/TimestampItemNormalizerTest.php
+++ b/core/modules/serialization/tests/src/Unit/Normalizer/TimestampItemNormalizerTest.php
@@ -18,6 +18,8 @@
  */
 class TimestampItemNormalizerTest extends UnitTestCase {
 
+  use TypedDataTestTrait;
+
   /**
    * @var \Drupal\serialization\Normalizer\TimestampItemNormalizer
    */
@@ -77,12 +79,18 @@ public function testNormalize() {
     $timestamp_item->getIterator()
       ->willReturn(new \ArrayIterator(['value' => 1478422920]));
 
-    $timestamp_item->getExposedProperties()
-      ->willReturn(['value' => 1478422920])
+    $exposed_property = $this->getTypedDataProperty();
+    $timestamp_item->getProperties(TRUE)
+      ->willReturn(['value' => $exposed_property])
+      ->shouldBeCalled();
+
+    $serializer_prophecy = $this->prophesize(Serializer::class);
+
+    $serializer_prophecy->normalize($exposed_property, NULL, [])
+      ->willReturn(1478422920)
       ->shouldBeCalled();
 
-    $serializer = new Serializer();
-    $this->normalizer->setSerializer($serializer);
+    $this->normalizer->setSerializer($serializer_prophecy->reveal());
 
     $normalized = $this->normalizer->normalize($timestamp_item->reveal());
     $this->assertSame($expected, $normalized);
diff --git a/core/modules/serialization/tests/src/Unit/Normalizer/TypedDataTestTrait.php b/core/modules/serialization/tests/src/Unit/Normalizer/TypedDataTestTrait.php
new file mode 100644
index 0000000000..257bf4ca38
--- /dev/null
+++ b/core/modules/serialization/tests/src/Unit/Normalizer/TypedDataTestTrait.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace Drupal\Tests\serialization\Unit\Normalizer;
+
+use Drupal\Core\TypedData\DataDefinitionInterface;
+use Drupal\Core\TypedData\TypedDataInterface;
+
+/**
+ * Test trait that provides functions for retreiving typed data properties.
+ */
+trait TypedDataTestTrait {
+
+  /**
+   * Gets a typed data property.
+   *
+   * @param bool $exposed
+   *   Whether the typed data property should be exposed.
+   *
+   * @return \Drupal\Core\TypedData\TypedDataInterface
+   *   The typed data property.
+   */
+  protected function getTypedDataProperty($exposed = TRUE) {
+    $exposed_definition = $this->prophesize(DataDefinitionInterface::class);
+    $exposed_definition->isExposed()
+      ->willReturn($exposed)
+      ->shouldBeCalled();
+    $exposed_definition = $exposed_definition->reveal();
+
+    $exposed_property = $this->prophesize(TypedDataInterface::class);
+    $exposed_property->getDataDefinition()
+      ->willReturn($exposed_definition)
+      ->shouldBeCalled();
+    return $exposed_property->reveal();
+  }
+
+}