Internally tagged enum deserialization regression in 1.0.39

[sfackler]

This program succeeds on 1.0.38 but fails on 1.0.39 and 1.0.40:

extern crate serde_cbor;

#[macro_use]
extern crate serde_derive;

#[derive(Serialize, Deserialize, PartialEq, Debug)]
#[serde(tag = "type")]
enum Foo {
    Foo { bar: u32 },
}

fn main() {
    let val = Foo::Foo { bar: 2 };
    let bytes = serde_cbor::to_vec(&val).unwrap();
    let val2 = serde_cbor::from_slice(&bytes).unwrap();

    assert_eq!(val, val2);
}

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: ErrorImpl { code: Message("invalid type: integer `2`, expected u32"), offset: 0 }', libcore/result.rs:945:5

[dtolnay]

Thanks, I released 1.0.41 with a fix -- 85ca12a.