Make MDProcessType JSON serializable

src/enums/MDProcessType.php

@@ -9,7 +9,7 @@
 /**
  * Represents a possible type of internal processes in a museum.
  */
-enum MDProcessType implements MDValueEnumInterface {
+enum MDProcessType implements MDValueEnumInterface, JsonSerializable {
 
     case project;
     case grant_application;
@@ -107,4 +107,15 @@ public function getTledName(MDTlLoader $tlLoader):string {
         return $tlLoader->tl("process_types", "process_types", $this->name);
 
     }
+
+    /**
+     * Provides the option to serialize as a string during json_encode().
+     *
+     * @return string
+     */
+    public function jsonSerialize():string {
+
+        return $this->name;
+
+    }
 }

src/enums/MDValueEnumInterface.php

@@ -55,4 +55,11 @@ public static function getSortedList(MDTlLoader $tlLoader):array;
      * @return string
      */
     public function getTledName(MDTlLoader $tlLoader):string;
+
+    /**
+     * Provides the option to serialize as a string during json_encode().
+     *
+     * @return string
+     */
+    public function jsonSerialize():string;
 }