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.
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