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## Summary
Properly handle binary operator inference for union types.
This fixes a bug I noticed while looking at ecosystem results. The MRE
version of it is this:
```py
def sub(x: float, y: float):
# Red Knot: Operator `-` is unsupported between objects of type `int | float` and `int | float`
return x - y
```
## Test Plan
- New Markdown tests.
- Expected diff in the ecosystem checks
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| build.rs | ||
| Cargo.toml | ||
| mdtest.py | ||
| mdtest.py.lock | ||