Interesting article. I did some digging and found this, which will be very helpful to me. I went through the entire hardware spec and identified each lock then went looking for the function. I had to try several wholesale websites before I found one that identified the F codes. Even the MFR websites didn't have them or buried them deep inside somewhere I didn't have the patience to find. Seems like it would be beneficial to everyone to provide the F code in the hardware schedules.
I wonder if any list is complete. That list doesn't include the "time out" lock function, and no other list I've found does, either. But this list also fails to include the "classroom security" lock function, which is what's now fairly standard for schools that don't use centralized, electronic locks. The "Classroom Secuity" function is an industry standard, and should be on any list.
The difference is that the traditional "Classroom" function only has a keyway on the corridor side. The teacher unlocks the door from the corridor side, and it remains unlocked until the teacher goes into the corridor and locks it. This was the standard classroom lock for decades -- until after the Columbine school shooting, when educators and school designers realized that it might not be a great idea for teachers to have to go out into the corridor to lock the classroom door if there's a shooter prowling the school.
So the lock industry came up with the "Classroom Security" lock function. This works just like the traditional "Classroom" function, except that it adds a keyway on the inside (classroom side). This means that teachers can lock the doors to their classrooms from the inside in a lockdown situation, without having to go into the corridor and be potentially exposed to gunfire.
A proper hardware schedule should include the function codes. The problem is that architectural specifiers are split into two camps on how to do this and who should do it. Some (like me, when I was writing specs) prefer to do this themselves. Others only do a bare-bones hardware spec, and leave it up to a hardware consultant working for the contractor or the hardware supplier to prepare a detailed hardware schedule as a shop drawing submittal. When it's done that way, the building department generally never sees it.
It's pretty amazing that Sifu caught this. Kudos!