> It's hard to believe that the system can detect that it's the "mean squared error". Is this an explanation a real example from the implementation, or it's just a handmade example?

> Don't you want to use the average instead of "0.5"?

It's from the real implementation. The code was some code a user sent in, which I ran the tool on.

> I tried and got the same outcome.

I fixed the waitlist– there was a problem, where if you typed your email then filled out the rest of the form without editing the email field, the waitlist signup would fail.

The live demo works for me and a couple others.