Test 4 has two tests expecting wrong value

[KingCode]

"For a shape to be a triangle at all, all sides have to be of length > 0, and the sum of the lengths of any two sides must be greater than or equal to the length of the third side."

Then the two following tests have the wrong expected value, which should be :isosceles instead

(= :illogical (triangle-type 1 2 1)) ;; 1 + 1 >= 2, 2 + 1 >= 1 therefore a valid triangle
(= :illogical (triangle-type 2 4 2));; 2 + 2 >= 4, etc