Contract period calculations in CPQ

Summary:

The libraries which come as part of Subscription Mgt package (which we load in CPQ) , have contract period defined as integer. It causes issue when date difference between contract start and end date is not exact multiple of periodicity. meaning if items' periodicity is 'Month' and contract duration is let's say 40 days then as per this standard library, it will show contract period as 2 instead of 1.3 (prorate basis)

Do we know if calculation of this period on prorate basis is done in any of the recent std library so that we don't have to spend time to write code again.