Post-run exploratory probe (not part of the frozen hidden test set):

Input: [(10**400, 10**400 + 2), (10**400 + 1, 10**400 + 3)]
Expected: [[10**400, 10**400 + 3]]

codex-1: pass
codex-2: pass
claude-4: OverflowError in math.isfinite(int)
claude-5: OverflowError in math.isfinite(int)

Python integers are finite; the task specification permits integers. This probe was
devised after inspecting the four patches, so it must not be presented as a
preregistered hidden-test result.
