PN_IS_REF         472 core/objmodel.c   if (PN_IS_REF(data)) return data;
PN_IS_REF         604 core/vm.c              if (PN_IS_REF(locals[op.b])) {
PN_IS_REF         612 core/vm.c              if (PN_IS_REF(locals[op.b])) {