Function optional_i64_array

include/engine/framework/io/json.h:149–156

inline std::string optional_nullable_string(const Value & object, const std::string & key, std::string default_value) {
    const auto * value = object.find(key);
    if (value == nullptr || value->is_null()) {
        return default_value;
    }
    return value->as_string();
}

template <typename T>
std::vector<T> number_array_as(const Value & value) {
    std::vector<T> out;
    out.reserve(value.as_array().size());
    for (const auto & item : value.as_array()) {