[Closed] Custom attributes and updating scripts

I’m making a level editor in MAXScript and all objects need custom attributes. If I run the script and create a scene with objects, save the scene, and load it up again, the custom attributes all work fine with the editor. However, if I update the script for the editor (even if I don’t edit the custom attribute definitions) the objects’ custom attributes no longer seem to be recognized. How do I make it so that the custom attributes will still be recognized by “later” versions of the script? (I’m defining custom attributes with names, not strings. Would it work with strings?)