[ty] Avoid transient AST ID merge map#26185
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Typing conformance resultsNo changes detected ✅Current numbersThe percentage of diagnostics emitted that were expected errors held steady at 94.37%. The percentage of expected errors that received a diagnostic held steady at 89.00%. The number of fully passing files held steady at 94/134. |
Memory usage reportMemory usage unchanged ✅ |
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AlexWaygood
approved these changes
Jun 21, 2026
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Summary
Merge per-scope AST ID maps directly into the final exact-capacity vector, removing a redundant hash table. This removes about 709 KB of transient allocation on Flake8 and 1.47 MB of copies on Sphinx.
Performance
Around 1-2% faster across the board
Test Plan
Testing: Passed ty_python_core tests, Clippy, and repository hooks.