C Longlong

Equivalent to C's signed long long (long long) type.

This type will almost always be [i64], but may differ on some systems. The C standard technically only requires that this type be a signed integer that is at least 64 bits and at least the size of a long, although in practice, no system would have a long long that is not an i64, as most systems do not have a standardised [i128] type.