Max, thanks for the reply.
> In the meanwhile I realized that check for modification by user should > be performed *before* tangle, and hash to detect changes is > appropriate for such purpose. I think, a copy of tangled file just to > detect modification will cause some tension from users. i guess you mean org's current "cache" stuff? > Comparison of earlier and current tangle results should be done at the > end, so implementation should be independent. There is no point to use > hash, size + byte to byte comparison is fast and reliable. that makes sense. cheers, Greg
