(undo-tree-save-format-version . 1)
"7d74e2ac4328851db67d0661b546c8625afa1bf8"
[nil nil nil nil (25198 59887 774810 940000) 0 nil]
([nil current ((1 . 6016) (t . 0)) nil (25198 59887 774806 682000) 0 nil])
nil