-- Homework 11, challenge: The nil mystery.
--
-- 1. Declare a local variable WITHOUT giving it a value.
-- 2. Print its type. (It will be nil.)
-- 3. Give it any value of any type.
-- 4. Print its type again.
-- 5. Add a --[[ ]] multi-line comment at the top of the file
--    explaining, in your own words, what nil means.
--
-- Run with: lua exercises/11/homework/04-nil-mystery.lua

-- Your code goes here: