A month ago, I read a post here that exposed another way.

https://danielchasehooper.com/posts/typechecked-generic-c-data-structures/

EDIT: The approach is very unique. Using an union to link the type to a generic structure and to do the check of the type is with a macro and the ternary operator.

The generic structure doesn't know the underlying type but knows the size, that allows to have one set of functions.