As medicine gets better and we develop a better understanding of how our bodies work this question will only get more difficult. At some point it will be possible to program your cells to repair any damage to your body including regenerating limbs or organs. And when you can do that, taking someone who is "dead", hooking them up to the "autodoc"[1] and having it repair the damage and restart them, then the only question might be how many short term memories did you lose? And if you can download those some how then even a partly decomposed body could be the source material for reconstructing the original, not a clone per se because parts of the original are re-used but certainly a full retrofit. Then a lot of built in human assumptions get really challenged.

[1] This is a name used in science fiction stories to describe the machine that mechanically repairs tissue damage.