queryset._clone() in generic views

What is 'queryset = queryset._clone()' statement in
django.views.generic.list_detail.object_list view used for?
Has it something to do with prevention of usage of cached results, to
allow QuerySet to reflect changes made to the database?
Should I use _clone(), too, if I'm reimplementing this view in order
to add some filtering? Or, maybe, I should use QuerySet.all() method
instead (i.e., 'queryset = queryset.all())?

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