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There are times when constructing trees and tables when you do not know how many rows will be retrieved from the DB without actually getting them all which is an expensive operation. Allow aria-setsize to take a value which means "unknown" or alternatively add another way to say "at least x" for the set size where x is the number of records known to exist at that time.
This is ISSUE-397 https://www.w3.org/WAI/PF/Group/track/issues/397
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