Split strict flag to particular

[darky]

Now for all cases exists only one strict flag. But very hard to satisfy all strictness at once.
Would be good to split strict flag to multiple like strict-as, strict-nested, strict-optional
strict flag preserve old behaviour, that all flags plug on.

[plantain-00]

This tool is not like tsc or eslint, they just fail if one case fails, but this tool is progressive, you don't have to be --at-least 100.
if some cases fail, maybe --at-least 99.99 can still make CI happy, you can still improve your code and the coverage number to 100 if you have time later.
I think splitting strict flag is too complex, they are doing same things, checking unsafe code.

[plantain-00]

v2.16.0 should support it.