[serde] Extend serde with custom macros?

#1

Is it possible to extend serde with custom attributes?
I want to deserialize json into a struct like struct Root { id: u32 }, so id will always be u32.
But sometimes I get { "id": "42" } instead of { "id": 42 }. For now I’ve solved this problem with serde’s deserialize_with and a custom function. But since I want to learn more about macros I would like to write

#[derive(Debug, Deserialize)]
struct Root {
    #[serde(always(u32))]
    id: u32
}

Is that possible? :confused:

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