(undo-tree-save-format-version . 1)
"c052d16705b6b5621b08e4fbb924bd16f19013a9"
[nil nil nil nil (25163 45230 131166 456000) 0 nil]
([nil current ((1 . 2333) (t . 0)) nil (25163 45230 131162 78000) 0 nil])
nil