You have to follow Marcel Weiher's work on combinators aka connectors.

The following article references his work on in-process rest, polymorphic identifiers, and storage combinators.

What Alan Kay Got Wrong About Objects

https://blog.metaobject.com/2019/11/what-alan-kay-got-wrong-...

Here's an ACM SIGPLAN talk he gave on storage combinators...

Storage Combinators @ SPLASH'19

https://www.youtube.com/watch?v=6FFlmkFS1YY

The ACM SIGPLAN talk is a very good starting place to get an understanding what he is talking about.