🔧 fix typing issues from checking untyped defs, fixes #509

[kevinsantana11]

One thing we should enable is the feature to disallow untyped definitions. This option was previously turned off but I've enabled it and fixed all of the issues listed (100+)

I still want to add some more changes here regarding standardizing on the array types we want to support as well as leveraging generics more with bounds to achieve some of the more dynamic behavior of the library.

This also follows the guidance from mypy to turn these feature on as soon as possible: article