smudge{type ‘a}(T.a : ‘a, T.b : boolean) 🡒 T.‘a, ordered aggregator

Takes an incomplete vector of T.a and a Boolean vector T.b that determines where the valid values are present. Returns a full vector of valid values, which has been completed by spreading valid values into the non-valid ones. More precisely, the output vector is built by looking at every line, group by group (if there is a by argument) and following the ascending sort, and replacing any non-valid value by the last value that has been seen, or by a default value if no valid value has yet been seen in the group.

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