You could add a 64-bit int type, sure, but since implementations use pointer-sized data that has to represent other types as well, making it as efficient as a l

You could add a 64-bit int type, sure, but since implementations use pointer-sized data that has to represent other types as well, making it as efficient as a long long in C isn't as easy. Seems unlikely to muster enough priority. (I haven't been following their work, though.)