(undo-tree-save-format-version . 1)
"21609a87a1ad50413bf006a9367e8e055fb15edb"
[nil nil nil nil (25164 53312 146746 994000) 0 nil]
([nil current ((1 . 2384) (t . 0)) nil (25164 53312 146742 516000) 0 nil])
nil