Re: size of int and uint. The size of these types have always been specified to be either 32 or 64 bits. The only change here is that 64-bit platforms will act

Re: size of int and uint. The size of these types have always been specified to be either 32 or 64 bits. The only change here is that 64-bit platforms will actually use that flexibility. The probably most important consequence is that now you can have very large slices. The length of a slice is defined as fitting in an int, so slices were restricted to 2B items (signed 32-bit max); now they can be much larger. I don't think there's any new gotcha here with having to test on multiple platforms. This is a change intended to give much more flexibility, but that flexibility naturally has to come with possible platform variation. If you are highly concerned with portability, avoid the int/uint types, and use the sized types (int32, int64, etc.) as much as you can. But in real code, as it turns out, it is rarely a big deal.