In the block of code displayed below

01.png

please note the block warning.

Now, in the block of code displayed below

02.png

please notice that the block warning is gone.

Which means that while

If (not isInt) then
confuses the thinAir algorithm that checks for block warnings, removing the parentheses

If not isInt then
does not.

It's not a big deal, but I thought I might as well bring it to attention.