I'm a retired physicist, with more than 40 years of high-tech development of hardware & software. It's now time for me to play with some Arduino projects. It reminds me of the old days with the M6800, 8080 and Z80. My first contact with computing was back in the late sixties

My only comment so far, reading the documentation, is that there is some lack of rigour in the "type declarations", which for me, with many years of quality management for industrial, medical and space projects, is a must to reduce errors. But by digging into the underlaying library ".h" and ".ccp" files I find the explanations needed.
Having real fun