Comment by MrMcCall

> int and Int64 aren't any more different from each other than Int64 and Int32

They are, though. Int64 and Int32 only differ in bit length and are in formats native to the host microprocessor. int has one of its bits "reserved" for the OCaml runtime, but Int32 has no such overhead.

> The fact that it offers a 63-bit integer doesn't really come into it.

It does if you interoperating with an OS's ABI though, or writing a kernel driver.

But you're right: there are a host of other reasons that OCaml shouldn't even have been brought up in this thread ;-)

Peace be with you, friend. Thanks for so generously sharing your expertise.