Frank - How did you find the switched neutral? Did you measure first or were you "surprised"? I've found them both ways, I'm sorry to say.
I didn't take a meter up with me (as it is, the trap doors are so small I can not put things in my pockets, and I need both hands to climb the vertical ladders so I put a few tools in a cloth bag at the end of a rope. I knew the power was off and checked that the lights didn't work, but even when I KNOW the power is off I use a old habit I developed when I was a field service tech.
1 Make sure the power is off
2. Before doing anything else use a screwdriver to short the screw over the power wire to the box ground.
3. Examine the big black spot on the screwdriver.
When I was a field service tech the local maintenance guy would sometimes take offense. I would show him the screw driver with the scars from previous customer sites.
Usually it was the wrong breaker, not a switched neutral.