code: @Override
      public Set<String> mergePossibleUserAttributeNames(final Set<String> toModify, final Set<String> toConsider) {
          toModify.addAll(toConsider);
          return toModify;
      }
docs: /* (non-Javadoc)
  @see org.jasig.services.persondir.support.merger.IAttributeMerger#mergePossibleUserAttributeNames(java.util.Set, java.util.Set)