#4 Tests?

I don't see any tests.

Does this handle Vec<Vec<String>>?

Ah ha! Tests... I'm missing tests.

No (not directly), it handles Vec<Data>... to have a Vec<Vec<String>> you'd have Vec<Data> with each Data being Vec<Data> of Data::String variant.

use data::Data;

fn main() {
  // outer is Data::Vec or Vec<Data>
  let outer: Data = Data::from(vec![
    // This is also Data::Vec or Vec<Data>
    Data::from(vec![
        // And finally our strings
        Data::from("Hello".to_string()),
        Data::from("World".to_string())
    ])
  ]);
  println!("outer = {}", outer);
}

This is more of a dynamic type, of select types. (String, i8 to i128, u8 to u128, f32 and 64, bool, Vec and HashMap allow for collections, with the ability of nesting)