sortOn: sorts range of aggregates by member name(s)

["Nordlöw" via Digitalmars-d]

Has there been any proposals to add a sort-wrapper, say sortBy,

in cases such as

     struct X { double x, y, z; }
     auto r = new X[3];

used as

     r.sortBy!("x", "y")

sorting r by value of "x" then "y".

If not and anybody is interest I could write one and make PR in 
std.algorithm.