make ints_to_string a method, so that it can be overridden in subclasses
make ints_to_string a method, so that it can be overridden in subclasses

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp