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fixes #639
This PR cherry picks the commits of #687 and adds a few test cases using the bar
calc
/setPositions
testing routine introduced in #716.In brief, as @keeganmccallum found, we must bucket stacks starting from
0
/ stacking in the +ve directions and stacks starting from0
/ stacking in the -ve direction in 2 separate buckets. We do so here by using the"-0"
identifier to store the stacks starting from0
/ stacking in the -ve direction.