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What's the best way to avoid an application conflict between the Book and Regular weight of a typeface family?
If there is a problem caused by an application going by the weight number -- and they are both designated as 400 -- rather than the weight name, is the solution to give the Book weight a numerical value of 350?
(The problem is that I already have a Light  and a Regular  weight, and a further weight in between is to be added, which would seem to indicate Book as a name.)