static class CIString implements Comparable<CIString> {
  final S s;
  
  *(S *s) { assertNotNull(s); }
  
	// note that eq(s, cistring) is still false
	public boolean equals(Object o) {
		if (o instanceof CIString)
			return s.equalsIgnoreCase(((CIString) o).s);
		if (o instanceof String) // One-way interoperability!
			return s.equalsIgnoreCase((String) o);
		return false;
	}
	
	public int compareTo(CIString cis) {
	  ret s.compareToIgnoreCase(cis.s);
	}
	
	public S toString() {
	  ret s;
	}
	
	public S str() {
	  ret s;
	}
}