(undo-tree-save-format-version . 1)
"1a2388445a689254ab2232f18c3f6933c5b0135b"
[nil nil nil nil (25163 46072 539103 76000) 0 nil]
([nil current ((1 . 2340) (t . 0)) nil (25163 46072 539098 357000) 0 nil])
nil