Category::Syntax error returned on valid JSON when deserializing incompatible type into enum value

[vegardgs-ksat]

I encountered the following situation:

Problem

#[derive(Debug, Deserialize, Serialize)]
pub struct ObjectWithAdt {
    pub kind: TypedVariant,
}

#[derive(Debug, Deserialize, Serialize)]
pub enum TypedVariant {
    A,
    B,
}

let payload = json!({
    "kind": 1,
});

let serialized = serde_json::to_string(&payload).unwrap();
let err = serde_json::from_str::<ObjectWithAdt>(&serialized).unwrap_err();
dbg!(&err);
assert_eq!(err.classify(), Category::Data);

Encountered the following error:

src/main.rs:55:5] &err = Error("expected value", line: 1, column: 9)
thread 'main' panicked at src/main.rs:56:5:
assertion `left == right` failed
  left: Syntax
 right: Data

Expectation

I expected something akin to this output:

src/main.rs:55:5] &err = Error("invalid type: integer `1`",  line: 1, column: 9)

I am sympathetic to the fact that which type to expect may be hard to capture as part of the error reporting. However, it comes across as incorrect that the error scenario is classified into Catalog::Syntax - the payload is clearly valid JSON.

See separate playground link for multiple permutations, including the failing scenario described herein.

[vegardgs-ksat]

I just found this open PR which improves the error messages for this scenario - I assume this also changes the Category into the correct one as well