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A range rule keys both the cell value and its own value into the order SAS uses for a numeric variable: every missing below every non-missing value, and the missing values ordered ._ then the regular missing then .A through .Z. So a range can be written in special missings and mean what SAS means by it - MINVAL .A with MAXVAL .C accepts .B and rejects .D - and the numeric cases follow from the same order: a missing fails a numeric MINVAL and passes a numeric MAXVAL, and a number sits above every missing. Replaces the "a range rule ignores a missing value" wording, which described the previous take's behaviour rather than SAS's.
Deploy steps in build.sh Note that the readme has been renamed to README.txt to prevent github pages from considering it to be the index by default!