code: func (t *Tree) Size(path string) (int64, error) {
  	e, err := t.FindEntry(path)
  	if err != nil {
  		return 0, ErrEntryNotFound
  	}
  
  	return t.s.EncodedObjectSize(e.Hash)
  }
docs: // Size returns the plaintext size of an object, without reading it
  // into memory.