Unable to deserialise tuple struct

[Martin Junghanns]

I am trying to do sth like:

#[derive(Deserialize, Debug)]
pub struct MyString(String);

#[derive(Deserialize, Debug)]
pub struct MyThing {
  my_string: MyString,
}

and I get:

Error: InvalidType { received: Str("foobar"), expected: "tuple struct MyString" }