2862922-set-maxlength-for

Closes #2862922

core/modules/telephone/src/Plugin/Field/FieldType/TelephoneItem.php

@@ -22,6 +22,8 @@
  */
 class TelephoneItem extends FieldItemBase {
 
+  const MAX_LENGTH = 256;
+
   /**
    * The maximum length for a telephone value.
    */