static boolean isIndeterminateLoner(InternalCache cache) {
    boolean isLoner = cache.getInternalDistributedSystem().isLoner();
    boolean pdxConfigured = cache.getPdxPersistent();
    return isLoner && !pdxConfigured/* && !hasGateways */;
  }
Check to see if the current member is a loner and we can't tell if the user wants a peer or a
client type registry.

@return true if this member is a loner and we can't determine what type of registry they want.
geode-core/src/main/java/org/apache/geode/pdx/internal/LonerTypeRegistration.java