valueLengthFromUri

    pub fn valueLengthFromUri(uri: Uri) usize {
        const user: Uri.Component = uri.user orelse .empty;
        const password: Uri.Component = uri.password orelse .empty;

        var dw: Writer.Discarding = .init(&.{});
        user.formatUser(&dw.writer) catch unreachable; // discarding
        const user_len = dw.count + dw.writer.end;

        dw.count = 0;
        dw.writer.end = 0;
        password.formatPassword(&dw.writer) catch unreachable; // discarding
        const password_len = dw.count + dw.writer.end;

        return valueLength(@intCast(user_len), @intCast(password_len));
    }