> I'm not sure what streaming iterators have to do with it; the thing I noted was simply that you only need two values at a time Yes, iterators have nothing to

> I'm not sure what streaming iterators have to do with it; the thing I noted was simply that you only need two values at a time Yes, iterators have nothing to do with the 'just compare the two changed values' optimization. I brought them up because the parent brought up issues of eager vs lazy loading and reading infinite input streams in chunk.