I love this paradox! It actually transforms into an interesting general heuristic for life[1]: basically, any time reality throws a categorization boundary at you (you observe f(a) = X and f(b) = not-X), gradually transform it (a to b) until you see exactly where the category flips.

For example, if you have a bug in case A but not case B, gradually transform A into B and see where it disappears.

If a law says that you can do X in condition A but not condition B, see if it's legal midway between A and B.

[1] which I call the "continuity heuristic" since it depends on reality obeying a rule that if a is close to b, f(a) is close to f(b).