[jdiomede]

It seems like asking about randomness is not a valid question. I'm not sure how you would implement that (beyond checking for the assignment of random behavior), you can't really find out until you observe a difference in behavior over a larger sampling.

[qntm]

If you're puzzled about the implementation, I invite you to inspect the JavaScript code! And if you disagree with my implementation, I'd be interested to know what you would do differently.

[jdiomede]

My statement was conceptual. Boolos himself suggests that we ask if X is random to get to a solution (though in a more complex iff statement). But being able to ask if a source is random seems unreasonable, though without that capability I can't say if there is a solution.