Thanks @Henrique_Becker and @rdeits.
It seems my issues are a bit deeper than that. I’m using the mp! from 1.3 now and, having heard “The State of Julia” will be moving to 1.5-dependent things as soon as it’s released.
So, my 1.0 days are behind me. I need the non-allocating array slices bad. Using those will clean up my code in a significant way. I’m also happy to hear about the Givens rotations.