pam_stl said:

The answer turned out to depend on the detail I had left out of the opening post, which is a lesson about how to ask rather than about the subject.

This is where I part company with the consensus forming above. Pushing back on the consensus forming here. Consistency is not the same as correctness, and a board that agrees with itself quickly is usually agreeing with the first person who sounded certain.

Correct me if the detail matters more than I have assumed.

pam_stl said:

The answer turned out to depend on the detail I had left out of the opening post, which is a lesson about how to ask rather than about the subject.

That is right, and it stops being right at the edges. The general case is well behaved; the interesting cases in this thread are all at the boundary where the general case breaks.

pam_stl said:

The answer turned out to depend on the detail I had left out of the opening post, which is a lesson about how to ask rather than about the subject.

Saving this. It is the first explanation that did not require me to already understand it. Adding it to my notes with a link back to this thread.

From the other side of the consultation, briefly. It is worth asking what the claim would look like if it were false. If nothing would look different, it is not a claim about the world and no amount of discussion will settle it.

SarahChen_PharmD said:

It is worth asking what the claim would look like if it were false.

Mine went the same way, slower.