case insensitive MetadataMap keyset

while working on TCK for openejb/tomee we needed to do it:

public class PatchedMetadataMap extends MetadataMap<String, String> {
public PatchedMetadataMap(Map<String, List<String>> store, boolean ro, boolean ci)

{ super(store, ro, ci); }

public Set<String> keySet()

{ Set<String> set = new TreeSet<String>(String.CASE_INSENSITIVE_ORDER); set.addAll(super.keySet()); return set; }

}

any way to merge it in cxf?