Fails to parse number with `+` prefix

[polarathene]

While this is a JSON5 feature rather than JSONC, the parser seems to implement support but fails?:

let parsed = jsonc_parser::parse_to_value(r#"{ "test": +42 }"#, &Default::default());
println!("{:#?}", parsed);

Outputs error:

Err(
    ParseError {
        range: Range {
            start: 10,
            end: 11,
        },
        message: "Unexpected token",
        display_message: "Unexpected token on line 1 column 11.",
    },
)

jsonc-parser/src/scanner.rs

Lines 272 to 293 in abd65a8

	match self.current_char() {
	Some('e') | Some('E') => {
	match self.move_next_char() {
	Some('-') | Some('+') => {
	self.move_next_char();
	if !self.is_digit() {
	return Err(self.create_error_for_current_char("Expected a digit"));
	}
	}
	_ => {
	if !self.is_digit() {
	return Err(self.create_error_for_current_char("Expected plus, minus, or digit in number literal"));
	}
	}
	}
	while self.is_digit() {
	self.move_next_char();
	}
	}
	_ => {}
	}

---

Or is this observation a misunderstanding? (it was first noted here)

It does seem accurate that this crate is more of a JSON5 parser than a JSONC one?

[polarathene]

Just after handling this report I recognized the Some('e') line as the E notation:

let parsed = jsonc_parser::parse_to_serde_value("1e-3", &Default::default()).expect("parse to value");
let num: f64 = serde_json::from_value(parsed.into()).expect("parse to float");

// 1e3 => 1000.0
// 1e+3 => 1000.0
// 1e-3 => 0.001
println!("{:#?}", num);

While comparing this crate to json5, I was thrown off a bit by all the extra parsing supported beyond what is expected for jsonc 😅 (most features seem to parse at a glance, beyond the number examples)