C++ interop - what to do about long and unsigned long?

[bearophile via Digitalmars-d]

Walter Bright:

> 1. elevate c_long and c_ulong into full fledged types.

This looks like the simpler and cleaner solution. What are the 
disadvantages of this solution?

(In my opinion the C++ interop topic is way less important/urgent 
than designing and implementing the tracking/scoping of memory 
areas in D. So I am seeing a priority problem here).

Bye,
bearophile