JSONC parser fails to correctly parse non-BMP escape sequences

[KiloJuliett]

In accordance with RFC 8258 § 7, the non-BMP character 𝄞 (U+1D11E) should be escaped as the escaped surrogate pair \uD834\uDD1E. Therefore, I expect the following Rust code to compile and run successfully:

use jsonc_parser::JsonValue;
use jsonc_parser::parse_to_value;

fn main() {
    let src = r#""\uD834\uDD1E""#;
    let v = parse_to_value(src, &Default::default()).unwrap().unwrap();
    if let JsonValue::String(s) = v {
        assert_eq!("\u{1D11E}", s)
    }
    else {
        panic!();
    }
}

However, on the latest version of jsonc-parser (as of writing, this is version 0.21.0), this code panics at the unwrap on line 6 with the message "Invalid unicode escape sequence. 'D834' is not a valid UTF8 character".

[polarathene]

Not entirely sure, but this recently merged RFC might be relevant.

Ron has adopted it in their v0.9 release instead of base64 for properly supporting roundtripping with byte strings. serde_json didn't have the issue though.