Deserialization of TokenInfo fails when serde_json's arbitrary_precision feature is enabled

[JamesHinshelwood]

I am enabling serde_json's arbitrary_precision feature in an upstream crate, which strangely causes the serde_json::from_slice::<serde_json::Value>(json_data) call in TokenInfo::from_json to return an Err.

I believe this is due to an issue in serde_json:
serde-rs/json#559

Apologies for raising the issue in this repository, but I would like to ask if you would consider accepting a workaround which means this crate can still be used when the arbitrary_precision feature is turned on? Specifically, I'd like to change the deserialization to

// Serialize first to a `serde_json::Value` then to `AuthErrorOr<RawToken>` to work around this bug in
// serde_json: https://github.com/serde-rs/json/issues/559
let raw_token = serde_json::from_slice::<serde_json::Value>(json_data)?;
let RawToken {
    access_token,
    refresh_token,
    token_type,
    expires_in,
} = <AuthErrorOr<RawToken>>::deserialize(raw_token)?.into_result()?;