(undo-tree-save-format-version . 1)
"9c44513319032bf5b9888fb886a712c2a042582c"
[nil nil nil nil (25198 61350 680971 59000) 0 nil]
([nil current ((1 . 5834) (t . 0)) nil (25198 61350 680966 330000) 0 nil])
nil