createColumnHelper's DeepKeys fails to properly resolve keys for accessor

[Akkuma]

TanStack Table version

v8.15.3

Framework/Library version

React

Describe the bug and the steps to reproduce it

AccessorFn works, but DeepKeys appears to fail to work as expected. By creating a fake implementation of createColumnHelper I isolated the issue down to however/whatever is happening in there.

Your Minimal, Reproducible Example - (Sandbox Highly Recommended)

https://stackblitz.com/edit/vitejs-vite-feb4sf?file=public%2Fproblem.ts&view=editor

Screenshots or Videos (Optional)

No response

Do you intend to try to help solve this bug with your own PR?

Maybe, I'll investigate and start debugging

Terms & Code of Conduct

• [X] I agree to follow this project's Code of Conduct
• [X] I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.

[KevinVandy]

I think this is a misunderstanding of how you can use TS generics.

This will never work because the type can be overridden, so TS doesn't guarantee any properties will be available.

I know it seems like it should work, it just won't in current TS.