Lesson 28, exercise 1

In exercise 1 of lesson 28, assigning type hints, one of the types listed should be **float**, otherwise the student won't know what type to assign to the 3.14 value. There's currently a Vector2 listed twice, including one with no parameters. I think that one should be replaced with **float**.

Open lesson 28 and inspect exercise 1, “assigning type hints.” Replace the duplicate Vector2 entry, including the one with no parameters, with float so the 3.14 value has the expected type; verify the exercise lists the corrected types.

Written by the indexing model from the issue text.