Total dimensions and weight calculation

If total_actual_weight is provided, it will prevail over the items' individual weights. It not provided, then the items' weights are mandatory and will be used to calculate the total package dimensions.
Likewise, if the box object is provided, then its dimensions will prevail over all individual items' dimensions and will be used to calculate the shipping rates. However, if the total box isn't provided, our algorithm will compute the best box based on the items' dimensions, which will then be mandatory.

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