Should `--extra-checks` be enabled by default

[KotlinIsland]

https://kotlinisland.github.io/basedmypy/command_line.html#cmdoption-mypy-extra-checks

This flag enables additional checks that are technically correct but may be impractical in real code. In particular, it prohibits partial overlap in TypedDict updates, and makes arguments prepended via Concatenate positional-only.

[KotlinIsland]

@DetachHead WDYT?

[DetachHead]

yea i think it should be enabled. btw whats the signature of dict.update look like? i assumed it would be covered by the existing rules unless some special case shit is going on