Map load unit testing and directory whitelisting - Mojave Sun is a really cool downstream, like and subscribe for longer PR names. oranges was here and made this github PR name much longer, thereby proving once and for all that upstreams do add value to the downstream not just endless amounts of refactoring because we can't write any api's in a modular fashion the first time around so have to update them later to be modular. Anyway do you think a taco counts as a sandwich? (#62620)