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When I use hexl-mode in emacs, it discards the buffer's undo info.
Is there another way to hex-edit the buffer and yet retain the undo info?

If there is no alternative hex-editor, is there a hex-viewer which can view the buffer? I have tried hexview-mode, but it doesn't view the actual buffer; it views the buffer's file (from disk), so I don't see the current edit.

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