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diff --git a/web/core/lib/Drupal/Core/Field/Annotation/FieldType.php b/web/core/lib/Drupal/Core/Field/Annotation/FieldType.php
index de42c80ff..8bf54cb58 100644
--- a/web/core/lib/Drupal/Core/Field/Annotation/FieldType.php
+++ b/web/core/lib/Drupal/Core/Field/Annotation/FieldType.php
@@ -91,4 +91,13 @@ class FieldType extends DataType {
    */
   public $list_class;
 
+  /**
+   * An integer defining a fixed cardinality for this field type.
+   *
+   * If this value is not set, cardinality can be configured in the field UI.
+   *
+   * @var int|null
+   */
+  public $cardinality;
+
 }