refactor: improvements to listing code for readability and less copy #1025
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Fixes #XXXX.
These changes don't impact functionality, but they do have performance benefits in the form of lowering memory utilization through the removal of a large number of clones in places where they are not required, which even in the case of Arc does involve a cost. Plus, parts of the code have been reorganized to be functional in nature and hence not require frequent iteration over the same members.
As a bonus, comments explaining working have also been included
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