static PRIntn CompareKeys(const PRUnichar* k1, const PRUnichar* k2)
static PRIntn CompareKeys( const nsAReadableString* k1, const PRUnichar* k2 )
static PRIntn CompareKeys(const PRUnichar* k1, const PRUnichar* k2){  return nsCRT::strcmp(k1, k2) == 0;}