By checking first if it's in item_types rather than checking if it can be dug into first.
For example: this allows extracting things like sectionListRenderer
Change usage of multi_deep_get to multi_get where possible
Remove checking of type from calls to get functions (because it's very unlikely Youtube suddenly changes the type without changing the name of the variable or anything, and it takes up unnecessary space)
Remove all default=None arguments from get functions, since those are superflous.
Remove list_types constant since it's no longer in use.
For example, "354 subscribers" wasn't being extracted correctly be extract_approx_int.
Make extract_approx_int and extract_int only extract integers that are words.
So e.g. 342 will not be extracted from internetuser342
