The problem with changing it in the library is that you'd also have to change it everywhere arrays are used in Julia itself. The only way I could think to mana

The problem with changing it in the library is that you'd also have to change it everywhere arrays are used in Julia itself. The only way I could think to manage it would be a pragma which switches 0-based on for a given file. But this is doubtlessly not trivial. Or there is the less elegant option of introducing a new operator for 0-based arrays. But this is liable to cause confusion I think.