#[derive(serde::Deserialize)]
#[serde(untagged)]
pub enum Untagged {
    #[serde(rename = "unit", alias = "_1")]
    Unit,

    #[serde(rename = "newtype", alias = "_2")]
    Newtype(u32),

    #[serde(rename = "tuple", alias = "_3")]
    Tuple(u32, u32),

    #[serde(rename = "struct", alias = "_4")]
    Struct { a: u32 },
}