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istringstream is a very slow way to parse this, let's make it a bit quicker. Some implementation numbers: 1. Original implementation - 1833556 calculations per second 2. std::strtoul implementation - 4666818 calculations per second - 2.54x the istringstream implementation 3. str::from_chars implementation - 5120718 calculations per second - 1.09x the std::strtoul implementation - 2.79x th istringstream implementation