Well, I understand one could interpret it that way -- only, that's not what rSign actually does :-)
void run()
{
StartDate = 2016;
EndDate = 2016;
BarPeriod = 1440;
ZigZag(series(price()), 150*PIP, 1, DARKGREEN);
plot("rSign", rSign, NEW, RED);
}
Yields the attached result. It appears that as soon as rSign recognizes that a new leg is being formed, it assumes -1 for a prior top and 1 for a prior bottom (as seen by the length of the legs in the image, and by the last value for rSign)...
In any case. Not a big deal, one just has to be aware of it either way.