// In case of conflict, updates all columns, including columns added
// in a future migration.
let upserted = try player.upsertAndFetch(db)

// In case of conflict, updates all columns, including future ones,
// but 'score'.
let upserted = try player.upsertAndFetch(db) { _ in
    [Column("score").noOverwrite]
}

// NEW! In case of conflict, do not update any column.
let upserted = try player.upsertAndFetch(db, updating: .noColumnUnlessSpecified)

// NEW! In case of conflict, only update 'name'.
let upserted = try player.upsertAndFetch(db, updating: .noColumnUnlessSpecified) { excluded in
    [Column("name").set(to: excluded[Column("name")])]
}