How do I serialize an enum without including the name of the enum variant?

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You can use the untagged attribute which will produce the desired output. You won’t need to implement Serialize yourself with this:

#[derive(Debug, Serialize)]
#[serde(untagged)]
enum TValue<'a> {
    String(&'a str),
    Int(&'a i32),
}

If you wanted to implement Serialize yourself, I believe you want to skip your variant so you should not use serialize_newtype_variant() as it exposes your variant. You should use serialize_str() and serialize_i32() directly:

impl<'a> Serialize for TValue<'a> {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        match *self {
            TValue::String(s) => serializer.serialize_str(s),
            TValue::Int(i) => serializer.serialize_i32(*i),
        }
    }
}

It produces the desired output: 

{"offset":0}

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