Make nil equivalent type to string and userdata

src/ScriptTypes/ScriptType.hpp

@@ -42,6 +42,11 @@ namespace Porygon{
         }
 
         virtual bool operator ==(const shared_ptr<const ScriptType>& b) const{
+            if (_class == TypeClass::Nil){
+                auto bClass = b->_class;
+                if (bClass == TypeClass::UserData || bClass == TypeClass::String || bClass == TypeClass::All)
+                    return true;
+            }
             return _class == b->_class;
         }