You called it wrong. It's a primitive and gives you choices. You can either: A) call it with sizeof(target) - 1 to explicitly tell it to NOT over-write the g

You called it wrong. It's a primitive and gives you choices. You can either: A) call it with sizeof(target) - 1 to explicitly tell it to NOT over-write the guard byte at the end, OR B) you can add an explicit operation to always over-write the byte at the end