diff --git a/core/lib/Drupal/Core/Field/FieldItemList.php b/core/lib/Drupal/Core/Field/FieldItemList.php
index 152005b..199f83c 100644
--- a/core/lib/Drupal/Core/Field/FieldItemList.php
+++ b/core/lib/Drupal/Core/Field/FieldItemList.php
@@ -409,7 +409,41 @@ public function equals(FieldItemListInterface $list_to_compare) {
     array_walk($value1, $callback);
     array_walk($value2, $callback);
 
-    return $value1 == $value2;
+    return $this->arrayEquals($value1, $value2);
+  }
+
+  /**
+   * Determines equality to another array type-wise.
+   *
+   * @param array $array1
+   *   The array to compare to.
+   * @param array $array2
+   *   The array to compare to.
+   *
+   * @return bool
+   *   TRUE if arrays are equal, FALSE if not.
+   */
+  protected function arrayEquals(array $array1, array $array2) {
+    $result = TRUE;
+
+    foreach ($array1 as $key => $value) {
+      if (is_array($value)) {
+        if (!array_key_exists($key, $array2) || !is_array($array2[$key])) {
+          return FALSE;
+        }
+        else {
+          $result = $result && $this->arrayEquals($value, $array2[$key]);
+        }
+      }
+      elseif (!array_key_exists($key, $array2)
+        || (gettype($array2[$key]) === gettype($value) && $array2[$key] !== $value)
+        || ($array2[$key] != $value)
+      ) {
+        return FALSE;
+      }
+    }
+
+    return $result;
   }
 
 }
diff --git a/core/tests/Drupal/Tests/Core/Field/FieldItemListTest.php b/core/tests/Drupal/Tests/Core/Field/FieldItemListTest.php
index 83a0854..c7abc99 100644
--- a/core/tests/Drupal/Tests/Core/Field/FieldItemListTest.php
+++ b/core/tests/Drupal/Tests/Core/Field/FieldItemListTest.php
@@ -133,6 +133,21 @@ public function providerTestEquals() {
     // not exist ('3').
     $datasets[] = [TRUE, $field_item_h, $field_item_i];
 
+    /** @var \Drupal\Core\Field\FieldItemBase  $field_item_j */
+    $field_item_j = $this->getMockForAbstractClass('Drupal\Core\Field\FieldItemBase', [], '', FALSE);
+    $field_item_j->setValue(['+2']);
+
+    // Tests field item lists where both have same values but different data
+    // types with leading plus.
+    $datasets[] = [FALSE, $field_item_e, $field_item_j];
+
+    /** @var \Drupal\Core\Field\FieldItemBase  $field_item_k */
+    $field_item_k = $this->getMockForAbstractClass('Drupal\Core\Field\FieldItemBase', [], '', FALSE);
+    $field_item_k->setValue(['02']);
+
+    // Tests field item lists where string values differ.
+    $datasets[] = [FALSE, $field_item_j, $field_item_k];
+
     return $datasets;
   }