With TS 3.4 it became common practice to create tuples with [a, b, c] as const. This is really convenient, however the resulting tuple is readonly. It would be awesome to add support for these readonly tuples, right now I get error readonly (something) is not assignable to any[].

The worksheets received from the Excel file do not keep the order.

...
{:ok, lists} = Xler.worksheets(file_path)
Logger.debug("lists: #{inspect(lists, pretty: true)}")
...

And run it a few times, result:

13:37:49.942 [debug] lists: ["Sheet2", "Sheet1", "Sheet3"]
13:37:49.942 [debug] lists: ["Sheet3", "Sheet2", "Sheet1"]

The order of the worksheets can be impor