Django 2 will be for python 3.5+ this is the perfect time to start 
adding Typing Annotations to django core.

There is not need to add to the full code base at once, this is something 
that could be faced in as new apis are written and added to older apis and 
sages.

In my view advantages of adding the typing are 3 fold. 

1) makes the code easier to read
2) IDEs (that support this) will be better able to help users, true the 
existing type info from doc strings is used but the `typing` module 
provides more control such as generics and typed list/dicts etc
3) Once complete Django can use mypy to validate the types across the code 
base helping with reducing feature bugs through simple to fix typing issues.

Im not sure if there is any large performance hit from using typing on a 
large project like Django does anyone know of any performance metrics on 
this?

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