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## Summary This PR includes minor improvements to binary operation inference, specifically for tuple concatenation. ### Before ```py reveal_type((1, 2) + (3, 4)) # revealed: @Todo(return type of decorated function) # If TODO is ignored, the revealed type would be `tuple[1|2|3|4, ...]` ``` The `builtins.tuple` type stub defines `__add__`, but it appears to only work for homogeneous tuples. However, I think this limitation is not ideal for many use cases. ### After ```py reveal_type((1, 2) + (3, 4)) # revealed: tuple[Literal[1], Literal[2], Literal[3], Literal[4]] ``` ## Test Plan ### Added - `mdtest/binary/tuples.md` ### Affected - `mdtest/slots.md` (a test have been moved out of the `False-Negative` block.)