WIP on docs and added basic enums supports

src/Entity/ObjectInstanciator.php

@@ -27,7 +27,16 @@ class ObjectInstanciator {
         
         return (string) $obj;
     }
-    
+
+    public function enum(\UnitEnum $obj)
+    {
+        if (! $obj instanceof \BackedEnum) {
+            throw new \Ulmus\Exception\BackedEnumRequired("Unable to extract a UnitEnum value from this variable. You must define your enum as a BackedEnum instead of an UnitEnum.");
+        }
+
+        return $obj->value;
+    }
+
     public function registerObject(string $type, Callable $callback) : void
     {
         $this->objectCallbackDefinition[$type] = $callback;