docs: public Set<? extends Processor<?, ?>> getAllProcessors() {
          IdentityHashMap<Processor<?, ?>, Void> all = new IdentityHashMap<>();
          all.put(this.getProcessor(), null);
          for (ProcessorGraphNode<?, ?> dependency: this.dependencies) {
              for (Processor<?, ?> p: dependency.getAllProcessors()) {
                  all.put(p, null);
              }
          }
          return all.keySet();
      }