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## Summary
Validates writes to `TypedDict` keys, for example:
```py
class Person(TypedDict):
name: str
age: int | None
def f(person: Person):
person["naem"] = "Alice" # error: [invalid-key]
person["age"] = "42" # error: [invalid-assignment]
```
The new specialized `invalid-assignment` diagnostic looks like this:
<img width="1160" height="279" alt="image"
src="https://github.com/user-attachments/assets/51259455-3501-4829-a84e-df26ff90bd89"
/>
## Ecosystem analysis
As far as I can tell, all true positives!
There are some extremely long diagnostic messages. We should truncate
our display of overload sets somehow.
## Test Plan
New Markdown tests
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| docs | ||
| src | ||
| tests | ||
| build.rs | ||
| Cargo.toml | ||
| CONTRIBUTING.md | ||
| README.md | ||
ty
ty is an extremely fast type checker. Currently, it is a work-in-progress and not ready for production use.
The Rust code for ty lives in this repository; see CONTRIBUTING.md for more information on contributing to ty.
See the ty repo for ty documentation and releases.