By "undodir" are you referring to the "vim-undodir-tree" plugin? Because the "persistent_undo" feature that is built into Vim/Neovim (normally) is what I think

By "undodir" are you referring to the "vim-undodir-tree" plugin? Because the "persistent_undo" feature that is built into Vim/Neovim (normally) is what I think of when I hear "undodir".