(undo-tree-save-format-version . 1)
"46f67f78f2d4e4187c8caa7ecae0b085da664657"
[nil nil nil nil (25163 46825 137561 178000) 0 nil]
([nil current ((1 . 2342) (t . 0)) nil (25163 46825 137553 664000) 0 nil])
nil