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All the Perl that's Practical to Extract and Report

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  • Still, I don't think that quite solves the problem if you assert a fact and your query fails, you probably want to retract that fact.

    This feels to me like you want an 'alternative futures' model of time: that is, when you backtrack, you not only go back to a previous 'time' but also arrange things so that when you go 'forward' again you are moving forward on a different timeline that diverges from the first at the point the backtrack went back to. If you change something and don't backtrack, subsequent c