feat: Add support for default values on metadata properties (#23)

refactor: Remove comment

src/Meta/MetaProperty.php

@@ -12,6 +12,11 @@ abstract class MetaProperty
         $this->value = $this->transform($value);
     }
 
+    public static function defaultValue(): mixed
+    {
+        return null;
+    }
+
     public static function make(mixed $value): static
     {
         return new static($value);

src/Meta/Reflection.php

@@ -73,6 +73,6 @@ class Reflection
             return $properties[0]->value;
         }
 
-        return null;
+        return $metaProperty::defaultValue() ?? null;
     }
 }