Take extra care when living on the edge (of a module): Don’t allow a type to appear in a module’s external interface unless you can ensure that all clients understand the type correctly. Use the highest level of abstraction that clients can understand.
The more widely distributed your library, and the less control you have over the build environment of all of its clients, the fewer the types that the library can reliably use in its external interface. Interfacing across modules involves binary data exchange. Alas, C++ doesn’t specify standard binary interfaces; widely distributed libraries in particular might need to rely on built-in types like
char to interface ...