APPLY_SAVING_ROD etc all map to saving throw

[mattgodbolt]

e.g.

    case APPLY_SAVING_PARA: ch.saving_throw += mod; break;
    case APPLY_SAVING_ROD: ch.saving_throw += mod; break;
    case APPLY_SAVING_PETRI: ch.saving_throw += mod; break;
    case APPLY_SAVING_BREATH: ch.saving_throw += mod; break;
    case APPLY_SAVING_SPELL: ch.saving_throw += mod; break;

Not sure this is intentional?

[mattgodbolt]

That said: items with multiple savings will stack, so something with s vs rod 10 and save sv spell 10 will get a saving roll of 20.