Function optional_i32

include/engine/framework/io/json.h:102–104

    const auto * value = object.find(key);
    return value != nullptr && value->is_number() ? value->as_i64() : default_value;
}

inline int64_t optional_nullable_i64(const Value & object, const std::string & key, int64_t default_value) {
    const auto * value = object.find(key);
    if (value == nullptr || value->is_null()) {
        return default_value;