From that document: This code implicitly assumes that vectors are indexed from 1; if dest starts at a different index than src, there is a chance that

From that document: This code implicitly assumes that vectors are indexed from 1; if dest starts at a different index than src, there is a chance that this code would trigger a segfault. (If you do get segfaults, to help locate the cause try running julia with the option --check-bounds=yes.) So it comes with a tradeoff, namely that if someone else chose different bounds on an array other than [1..n] and you try to access it the standard way, you'll get a segfault. This would scare me away from using anything other than the default indexing on an array in Julia.