Add basic arbitrary-model-tests based fuzzing #14
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This fuzzes the implementation against a reference model (in this case just a
Vecwith a bit of pre-validation of the operation to make it fixed length). After just a couple minutes of fuzzing I didn't find any behaviour differences, but it did find an underflow while calculating the end index fordrain(which after a little investigation also causes behaviour differences). I've fixeddrainand added edge-case tests for it.