"Since September 2019 all spec violations have been addressed by Apple, as recorded in the next section. The section thereafter - "Peculiarities" lists specific implementation choices by Apple that differ from what most implementations provide, but are not spec violations per se."
That list of "peculiarities" is pretty disappointing. The lack of a discovery endpoint is sad; it isn't that difficult to provide and it greatly reduces the obscurity of configuring RPs.
