Comment by ravi-delia

Ok, running this by you one more time. There is a type called "int" in the language. This is a 63-bit signed integer on 64-bit machines, and a 31-bit integer on 32-bit machines. It is stored in 64 bits (or 32), but it's a 63-bit signed integer, because one of the bits is used in the runtime. There is also a 64 bit integer, called "Int64". It has 64 bits, which is why I call it a 64-bit integer rather than a 63-bit integer. An "int" is a 63-bit integer, which is why I call it a 63-bit integer rather than a 64-bit integer.