Copter: Constant comparisons are made first

[muramura]

The config parameter value does not change.
It is better to check the one whose value does not change first.

[peterbarker]

You are correct that it is more economical to do the checks in the order you've put them in.

However, the number of times this check has not had to run both halves (and succeeded), ever, on the planet is probably in the hundreds. After all, this is an pre-arm check, and the user has had to mis-configure their vehicle to fail the check.

The change occludes history in the file.

The costs and risks associated with such a patch just don't add up to this being a good deal, sorry.