Error in chapter 7 (The Bad Parts): type(aVar?) doesn't work as described

[mklement0]

Chapter 7 says:
"
If you're checking to see if an variable has been defined, you'll still need to use typeof otherwise you'll get a ReferenceError.

if typeof aVar isnt "undefined"
    objectType = type(aVar)

Or more succinctly with the existential operator:

objectType = type(aVar?)

"

However, the two statements are NOT equivalent, because type(aVar?) will unconditionally return "boolean", because applying the existential operator to a variable always returns a Boolean.