All three lines would be "insane" if the variables weren't mutated. As in a variable named "three" is insane if it solely contains either of the values 1 or 3.
When it contains other values it is still subpar variable naming.
If something looks insane, but probablu sane person made it and it works then that's usually good indicator that you are missing part of the picture and should look around. It still might be bad, but probably not insane.
When it contains other values it is still subpar variable naming.