Julia multi-key stable sort with nulls last

record(name, score, age) = (; name, score, age)

rows = [
    record("ann", 90, 31),
    record("bob", missing, 24),
    record("cid", 90, 22),
    record("dee", 75, 40),
]

# missing scores sort last; negation gives descending score
sorted = sort(rows; by=r -> (ismissing(r.score), -coalesce(r.score, 0), r.age))

for r in sorted
    println(r.name, "  score=", r.score, "  age=", r.age)
end