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## Summary This PR fixes various TODOs around overload call when a variadic argument is used. The reason this bug existed is because the specialization wouldn't account for unpacking the type of the variadic argument. This is fixed by expanding `MatchedArgument` to contain the type of that argument _only_ when it is a variadic argument. The reason is that there's a split for when the argument type is inferred -- the non-variadic arguments are inferred using `infer_argument_types` _after_ parameter matching while the variadic argument type is inferred _during_ the parameter matching. And, the `MatchedArgument` is populated _during_ parameter matching which means the unpacking would need to happen during parameter matching. This split seems a bit inconsistent but I don't want to spend a lot of time on trying to merge them such that all argument type inference happens in a single place. I might look into it while adding support for `**kwargs`. ## Test Plan Update existing tests by resolving the todos. The ecosystem changes looks correct to me except for the `slice` call but it seems that it's unrelated to this PR as we infer `slice[Any, Any, Any]` for a `slice(1, 2, 3)` call on `main` as well ([playground](https://play.ty.dev/9eacce00-c7d5-4dd5-a932-4265cb2bb4f6)). |
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