"'Choose up to 13 widgets'" is very clear, never means anything else, and is not an odd phrase nor an idiomatic expression. The individual words each use exactly their individual meanings. A logical mind would not try illogical contortions of the language to wring other meanings from the text.Reference: VtES Usenet Newsgroup.
You may choose 1. You may choose 2. Indeed, you may choose any number up to 13. You may not choose 14, of course, since 14 is not found on your way up to 13. You may choose 10, of course, since 10 is found on the way up to 13." -- Part of LSJ really lengthy answer on how the card text of Ashur Tablets need to be read.