Initial support for fuzzing #4
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Initial support for fuzzing.
Since the crate does not have any unsafe code, the fuzzing can be run without Address Sanitizer for a bit of a speed boost:
cargo +nightly fuzz run hard_u128_to_f64_roundI'm not convinced that this is better than a dumb RNG in this case, since fuzzing relies on branches for making decisions about the input, and there isn't a lot of branches in this code.