Sorting : original-date vs date

Let's say your style contains this:





That's not common at the moment because storing the original-date is a bit hackish.The issue is that items with an original date are sorted before those which don't have one, even if they are actually subsequent (reprinted) edition.
E.g:
Doe, Book, 12th ed., 2002 [1933], xx+1150 p.
Doe, Book, 1st ed., 1892, x+723 p.
Doe, Book, 2nd ed., 1893, xii+759 p.

The solution would be, for the purpose of sorting, to assume that the original-date of an item is its date, when nothing is stored in its original-date field.

What do you think of that?
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