I once wrote a fuzzer for some code that serialized and deserialized a particular data structure that included a timestamp -- the complexity cannot be overstate

I once wrote a fuzzer for some code that serialized and deserialized a particular data structure that included a timestamp -- the complexity cannot be overstated. Basically every possible edge case came up: floats can be infinity, negative infinity, negative zero, NaN, and even subnormal. The bulk of the problems occurred because we deserialized the float timestamp and proceeded to do unchecked math on it, then expected it to be a normal value.