Function optional_f32

include/engine/framework/io/json.h:106–109

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;
    }
    return value->as_i64();
}

inline int optional_i32(const Value & object, const std::string & key, int default_value) {