[Enhancement] No strict option for setup.cfg

[marmistrz]

I tried to use strict mode from a configuration file:
setup.cfg:

[mypy]
strict=True

Then mypy says that the option is not recognized. It would be nice to be able to enable strict mode from the setup.cfg

[ethanhs]

I don't know of a conscious decision to leave this option out. It appears it is also not available in mypy.ini as well. It should be pretty easy to fix in our option parsing.

[gvanrossum]

It was a conscious decision -- nothing in mypy checks for 'options.strict', instead --strict just turns on a bunch of other flags, and the logic to do this correctly from the config file was too convoluted to do. Nevertheless we might be able to do this, but since it's really just a shorthand, I recommend being explicit in your config file.

[PiDelport]

I found this issue after being confused by the "Unrecognized option: strict" message.

The reasoning for not supporting it makes sense: maybe it's worth making MyPy show a message explaining that this is intentional and what to do instead, rather than just giving the uninformative "Unrecognized option" message?

Current message:

mypy.ini: [mypy]: Unrecognized option: strict = True

Straw suggestion:

mypy.ini: [mypy]: strict = True is not supported here: specify individual options instead

[JukkaL]

Improving the error message is a good idea.