public bool IsProperSubsetOf(JsImplIEnumerable <T> other)
 {
     throw new NotImplementedException();
 }
 public void SymmetricExceptWith(JsImplIEnumerable <T> other)
 {
     throw new NotImplementedException();
 }
 public bool SetEquals(JsImplIEnumerable <T> other)
 {
     throw new NotImplementedException();
 }
 public void IntersectWith(JsImplIEnumerable <T> other)
 {
     throw new NotImplementedException();
 }
 public bool Overlaps(JsImplIEnumerable <T> other)
 {
     throw new NotImplementedException();
 }