C Macros and Let Polymorphism

We use macros for constants quite a lot at work, and it occurred to me that since a macro is replaced at a token level (before parsing and certainly before type checking) and since C will do coercive casting on literals, macros are somewhat like a limited form of Let Polymorphism. Obviously they not the same thing, but in practice you sometimes get the advantages of Let Polymorphism in that you get the same expression at several types.