(undo-tree-save-format-version . 1)
"5d3801edf9228d3774d584262e2731a23ff38fa3"
[nil nil nil nil (25165 33587 477779 459000) 0 nil]
([nil current ((1 . 2687) (t . 0)) nil (25165 33587 477775 191000) 0 nil])
nil