directionDisagreements

Pairs where the guard's verdict depends on which prompt arrived first.

Reported, never asserted. A directional guard is legitimate, and kmemo's own subspan is one, because "the same question plus a narrowing clause" is a relationship with a direction. But an author who did not mean to be directional has no other way to find out, and in a cache the consequence is a verdict that changes depending on which of two prompts a user happened to ask first.