Bank update

I just talked to the bank, who in turn talked to people "higher up." Although it is too late to issue a stop payment, it turns out that there are still protocols for fixing mistakes with a check. I believe that, essentially, they request the bank at the other end to return the funds and contact me directly about the check.

It is not guaranteed. The other end can refuse. But it is typically successful more often than unsuccessful. We'll just have to wait and see how it plays out.