Instantiator instantiatorFor(Set<EncodingInfo> encodings) {
      Inflater inflater = typeFactoryAndInflater().inflater;
      synchronized (instantiators) {
        return instantiators.computeIfAbsent(encodings, inflater::instantiatorFor);
      }
    }
Check if {@code qualifiedName} is known to current environment (annotation processor).
Retrieve (by canonical name) {@link TypeElement} from APT environment.
value-processor/src/org/immutables/value/processor/meta/Proto.java