Issue #3177545 by alexpott, andypost:...

Issue #3177545 by alexpott, andypost: \Drupal\field\Entity\FieldStorageConfig::getCardinality() needs to be more type safe

core/modules/field/src/Entity/FieldStorageConfig.php

@@ -632,11 +632,11 @@ public function getCardinality() {
     /** @var \Drupal\Core\Field\FieldTypePluginManager $field_type_manager */
     $field_type_manager = \Drupal::service('plugin.manager.field.field_type');
     $definition = $field_type_manager->getDefinition($this->getType());
-    $enforced_cardinality = isset($definition['cardinality']) ? $definition['cardinality'] : NULL;
+    $enforced_cardinality = isset($definition['cardinality']) ? (int) $definition['cardinality'] : NULL;
 
     // Enforced cardinality is a positive integer or -1.
     if ($enforced_cardinality !== NULL && $enforced_cardinality < 1 && $enforced_cardinality !== FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED) {
-      throw new FieldException("Invalid enforced cardinality '$enforced_cardinality'. Allowed values: a positive integer or -1.");
+      throw new FieldException("Invalid enforced cardinality '{$definition['cardinality']}'. Allowed values: a positive integer or -1.");
     }
 
     return $enforced_cardinality ?: $this->cardinality;