Looking for a clean way to add a row in a DataFrame

General Usage
, ,
5

Given data.csv:

a,b,c
1,2,3
4,5,6

You can do this:

CSV.read(
    ["data.csv", "data.csv"],
    DataFrame;
    source = :Set => [1, 2]
)

to get

4×4 DataFrame
 Row │ a      b      c      Set   
     │ Int64  Int64  Int64  Int64 
─────┼────────────────────────────
   1 │     1      2      3      1
   2 │     4      5      6      1
   3 │     1      2      3      2
   4 │     4      5      6      2
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