Additionally, c_setminmax(my) now works in the first frame of an action, beforehand you've had to wait a frame to get the real bb size:

A7 :
action my_action() {
wait(1);
c_setminmax(my);
}

A8 :
action my_action() {
c_setminmax(my);
}

Without the wait, the NARROW and FAT flags would have been set but not the real size because min/max was set at entity creation, that is in A7 the first frame.

(Everything is subject to correction.)