@Nonnull
    @Override
    public <T extends Consumer<InventoryClickEvent>> Slot bindAllConsumers(@Nonnull Iterable<Map.Entry<ClickType, T>> handlers) {
        return this;
    }
Useless implementation of {@link Slot} to fulfill not-null contracts.
helper/src/main/java/me/lucko/helper/menu/DummySlot.java