'columns' unparse config not working when first object doesn't have all properties

When using the columns unparse config option together with a data array where the first object does not have all properties that are listed in the columns array, then not all columns of the columns array are used even if later objects have these values.

E.g.

const columns= ["First", "Second", "Third"];
const rows= [
  { First: "1-1"},
  {
    First: "2-1",
    Second: "2-2",
    "Third": "2-3",
  },
];
const result = Papa.unparse(
  { data: rows},
  {
    header: true,
    columns: columns,
  }
);
console.log(result)

The result is

First
1-1
2-1

instead of the expected

First,Second,Third
1-1,,
2-1,2-2,2-3

[pokoli]

I guess the problem is that the columns array is modified on the first colum when it should not be. Could you please upload a PR to fix it which includes a minimum test case (your example sounds like a good solution)

[TheSlimvReal]

Generally, I am wondering whether the options columns and fields are not the same thing and columns could therefore be removed?