[red-knot] fix: improve type inference for binary ops on tuples #16725
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Summary
This PR includes minor improvements to binary operation inference, specifically for tuple concatenation.
Before
The
builtins.tupletype 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
Test Plan
Added
mdtest/binary/tuples.mdAffected
mdtest/slots.md(a test have been moved out of theFalse-Negativeblock.)