Unable to deserialise a single string

[Firstyear]

https://datatracker.ietf.org/doc/html/rfc6749#section-2.3.1 specifies that the client_id may be urlencoded such as my%2Did.

However, trying to use this library, this can not parse due to the error:

"invalid type: map, expected a string"

let r: Result<String, _> = serde_urlencoded::from_str("my%2Did");

I expected that this would work, but I suspect that a map type is forced?