(undo-tree-save-format-version . 1)
"f540ab3c0f027ac51a30c7f65a931651d1285ce1"
[nil nil nil nil (25162 13694 949793 701000) 0 nil]
([nil current ((1 . 2053) (t . 0)) nil (25162 13694 949789 363000) 0 nil])
nil