This makes a lot of sense if you consider that it is consistent with the rest of the language. It is one more way to set up tripwires in your code to to catch your own programming errors. Similar to using asserts in your functions to vet input and output.

I use Array list a lot so excited to add this throughout the code to harden them.

I can imagine this is not everyone's cup of tea, but then you probably also wouldn't enjoy any of the other explicitness.