code: func forEachExample(ctx context.Context, tx Tx, fn func(*platform.User) bool) error {
  	b, err := tx.Bucket(exampleBucket)
  	if err != nil {
  		return err
  	}
  
  	cur, err := b.Cursor()
  	if err != nil {
  		return err
  	}
  
  	for k, v := cur.First(); k != nil; k, v = cur.Next() {
  		u := &platform.User{}
  		if err := json.Unmarshal(v, u); err != nil {
  			return err
  		}
  		if !fn(u) {
  			break
  		}
  	}
  
  	return nil
  }
docs: // forEachExample will iterate through all examples while fn returns true.