code: func NewFileIter(s storer.EncodedObjectStorer, t *Tree) *FileIter {
  	return &FileIter{s: s, w: *NewTreeWalker(t, true, nil)}
  }
docs: // NewFileIter takes a storer.EncodedObjectStorer and a Tree and returns a
  // *FileIter that iterates over all files contained in the tree, recursively.