Type-safe Deedle Columns

Hey everybody!
I would like to aggregate, sort and select data from csv-files.

In the deedle documentation columns are addressed by “string”.

I have used

module Columns =
    let Month = "Month"
    let Year = "Year"
    let Costs = "Costs"

open Deedle
module C = Columns

df |> Frame.aggregateRowsBy
    [ C.Month;
    [ C.Costs ]

which involves a lot of repetition. Does anybody know a better way to do it?