Improve challenge

Author: laike9m

challenges/extreme-variance/question.py

@@ -20,3 +20,8 @@ def g(a):
 l2: list[int | str] = [1, 2]
 f(l2)
 g(l2)
+
+f(1)  # expect-type-error
+f("1")  # expect-type-error
+g(1)  # expect-type-error
+g("1")

challenges/extreme-variance/solution.py

@@ -22,3 +22,8 @@ def g(a: Sequence[int | str]):
 l2: list[int | str] = [1, 2]
 f(l2)
 g(l2)
+
+f(1)  # expect-type-error
+f("1")  # expect-type-error
+g(1)  # expect-type-error
+g("1")