docs: private ValidationResult popValidationResult() {
          // really a shift
          ValidationResult vr = null;
  
          synchronized (pendingValidationResultsLock) {
              try {
                  if (!pendingValidationResults.isEmpty()) {
                      vr = pendingValidationResults.remove(0);
                  }
              } catch (Exception e) {
                  // no-op
              }
          }
          return vr;
      }