Typed annotations / data structures

Next milestone add these for all objects

[`TypedDict`](https://peps.python.org/pep-0589/) w/ [`total=False`](https://peps.python.org/pep-0589/#totality) may be a good contender for object structure as its standard library 3.8+ and 3.7 and 3.8 will be dropped after 0.11 is released