Bug in print2 of Tutorial

Hi, Shouldn't the lines n.find_bool(name, x); n.find_unsigned(name, x); n.find_string(name, x); in static void my_print2(const archive_node & n); of the Tutorial be replaced with the following ones: n.find_bool(name, x, j); n.find_unsigned(name, x, j); n.find_string(name, x, j); ? I noticed that when extracting info from fderivative instance. I was expecting 'D[0,1](f)(x,y)' but I was getting 'D[0,0](f)(x,y)' from 'f(x,y).diff(x).diff(y)'. The change above fixed this. As I understand, then all items in property p[i] should be of the same type. Is this always true? Regards, Pearu