@api: One attribute to rule them All

[Zach the Mystic via Digitalmars-d]

Martin Nowak is the one who created the issue for this 
enhancement request:

https://issues.dlang.org/show_bug.cgi?id=10979

He proposes a different solution though - creating two mangled 
names for each function. The advantage, as far as I can see it, 
is that you wouldn't even have to add "@api" or "extern(noinfer)" 
to link properly. I see two disadvantages: the binary would 
suffer bloat, and the generated .di signatures would have to 
default to the conservative explicit signature, since is could 
not include both signatures without causing a duplicate 
definition.