> b7- ability to distinguish different types of the same dimension (e.g. >width of image and width of screen)
Other examples: It should be an error to try to add gallons of gasoline to gallons of propane. Not to mention trying to add gallons of unleaded regular gasoline to unleaded premium gasoline. Except that for certain purposes "hash totals" for example) there must be a way to do the otherwise illegal operation.
--Beman
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