PN_TDOUBLE         37 core/internal.c   potion_type_new(P, PN_TDOUBLE, num_vt);
PN_TDOUBLE        208 core/internal.c   case PN_TDOUBLE:    	return 'D'; //4
PN_TDOUBLE        441 core/number.c    PN dbl_vt = PN_VTABLE(PN_TDOUBLE);
PN_TDOUBLE        703 core/objmodel.c   potion_init_class_reference(P, potion_str(P, "Double"),       PN_VTABLE(PN_TDOUBLE));
PN_TDOUBLE        163 core/potion.h  #define PN_IS_DBL(v)    (PN_IS_PTR(v) && ({PNType _t = potion_qptr_type((PN)v); _t == PN_TNUMBER || _t == PN_TDOUBLE;}))