fix logic bug in .range of sorted set/map
#3055
Merged
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The external iterator version of
@sorted_set.SortedSet::rangeand@sorted_map.SortedMap::rangehas logical bug, as correctly pointed out by Copilot in #3050. But there two API has only very minimal test, so the bug is not spotted. This PR fixes the bug and add a little more tests to the tworangemethods.