Function parse

src/framework/io/json.cpp:282–304

bool Value::is_string() const noexcept {
    return kind_ == Kind::String;
}

bool Value::is_array() const noexcept {
    return kind_ == Kind::Array;
}

bool Value::is_object() const noexcept {
    return kind_ == Kind::Object;
}

bool Value::as_bool() const {
    if (!is_bool()) {
        throw std::runtime_error("json value is not a bool");
    }
    return bool_value_;
}

double Value::as_number() const {
    if (!is_number()) {
        throw std::runtime_error("json value is not a number");
    }
    return number_value_;
}

int64_t Value::as_i64() const {