[scikit-learn] Is there any official position on PEP484/mypy?

[Andreas Mueller]

On 07/30/2016 03:20 AM, Alexandre Gramfort wrote:
>> I am still worried that this is going to add even more complexity to
>> contributing: people will contribute without knowing type hint, CI will
>> break, they won't understand why it breaks, won't be able to reproduce
>> it, and it will stall PRs.
> +1
>
> same feeling here.
>
That is "only" a concern if they change the type of something that is 
annotated, right?
Is that something that happens often?
I guess it would also break if someone adds an argument to an annotated 
function,
that might happen more often.