support `Not` types
Open
needs-discussion
typechecking
- Dominant language
- Rust
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- 7k
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Description
### Describe the Bug
```py
def f(a: object):
if not isinstance(a, int):
reveal_type(a) # object, expect ~int
```
### Sandbox Link
_No response_
### (Only applicable for extension issues) IDE Information
_No response_
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