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so that when the dependent object is checked, matches can be pulled out and
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evaluated in-line rather than re-reading the same data many times.
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check_refs are tuples (kind, value). Currently defined kinds are:
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* 'trees', where value is a revid and the looked up objects are revision trees.
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* 'lefthand-distance', where value is a revid and the looked up objects are the
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distance along the lefthand path to NULL for that revid.