code: func NewBlobIter(s storer.EncodedObjectStorer, iter storer.EncodedObjectIter) *BlobIter {
  	return &BlobIter{iter, s}
  }
docs: // NewBlobIter takes a storer.EncodedObjectStorer and a
  // storer.EncodedObjectIter and returns a *BlobIter that iterates over all
  // blobs contained in the storer.EncodedObjectIter.
  //
  // Any non-blob object returned by the storer.EncodedObjectIter is skipped.