Reorder conditions of needed?
          #433
        
          
      
                
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out_of_date?should care about "date" concepts, and not concerning about "build_all" option.Reordering allows us to remove the "build_all" check in the out_of_date, achieving the quality statement in the second item of the previous list.
Suddenly, there is no need to make a distinction between FileTask or other tasks.