Supporting TimedArray and PoissonInput was straightforward and adding custom functions needed a small discussion. The main part was array_cache implementation, which made the device complete (or something like subset of standalone device). Test cases dealing with devices was very involving, as for each cases proper reinit has to be inserted and takes a lot of patience to make all test cases work :/ I remember, we had a meeting and made debugging on what went wrong, and finally made all test cases to work successfully. Very kind of my mentor for helping me fix that!