docs: public boolean allowsNameSiblings( Name primaryType,
                                         Set<Name> mixinTypes ) {
          if (isUnorderedCollection(primaryType, mixinTypes)) {
              // regardless of the actual types, if at least one of them is an unordered collection, SNS are not allowed
              return false;
          }
          if (nodeTypeNamesThatAllowSameNameSiblings.contains(primaryType)) return true;
          if (mixinTypes != null && !mixinTypes.isEmpty()) {
              for (Name mixinType : mixinTypes) {
                  if (nodeTypeNamesThatAllowSameNameSiblings.contains(mixinType))
                      return true;
              }
          }
          return false;
      }