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Fixes #290. Checking for overflow should be done before integer overflows. There are two checks: (result > limit / base) is used for limits greater than rounded up to base, e.g. for 65535 it will activate for 65540 and higher. (result * base > limit - digit) is used for limit+1 to limit+n below next base rounded number, e.g. 65536 up to 65539.