John Higdon wrote:

Do you honestly believe I don't know what a "checksum" is? If so, then
my only error was overestimating the contextual comprehension of the
readers of this group.

I'm looking for an "Sorry, I was wrong" from you. It will be an historic
occasion when I read it. Heck, you've seen me admit I'm wrong, many times.
Is it so hard to admit you're wrong?