All changes can have screwups; but a lot of these are moving things around and fairly mechanical infrastructure changes; so it shouldn't be that dangerous.

It seems to be rejigging header files so largely not adding new functionality or modifying code, but giving the compiler a lot less work to do.

It is not a code change per-se as much as a change to how the files are built.

Think of it like changing the order around of how you cook a fine meal and putting a few tricks all senior chefs know into the recipe explicitly. No ingredients were added or removed, do poison doesn’t get accidentally added.