Re: [PATCH 13/37] qapi/common.py: add notational type hints

[John Snow]

On 9/17/20 2:18 PM, John Snow wrote:
> Your type hint adds a restriction that wasn't there before.
>
> Is there a better way?

I've settled on using the `object` type for now, which is slightly more 
restrictive than `Any`.

`Any` and `object` both allow any type of argument, but `Any` 
effectively creates a gradually typed boundary in which you are 
implicitly casting to whatever typed boundary it enters next.

`object` is an explicit cast to the most abstracted type; any further 
usage that is not supported the base object will be rejected.

This is nice, because if someone adds a call at or below the mcgen 
level, mypy will certainly complain that they are assuming too much 
about the type -- and they would be!

The rest of my series will now take this approach: prefer `object` to `Any`.

--js