Document Union nullability contract#8713
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CodSpeed HQ / CodSpeed Performance Analysis
failed
Jul 10, 2026
1 benchmark regressed
⚡ 3 improved benchmarks
❌ 1 regressed benchmark
✅ 1626 untouched benchmarks
⏩ 42 skipped benchmarks1
Warning
Please fix the performance issues or acknowledge them on CodSpeed.
Performance Changes
| Mode | Benchmark | BASE |
HEAD |
Efficiency | |
|---|---|---|---|---|---|
| ❌ | Simulation | compact_sliced[(4096, 90)] |
779.7 ns | 867.2 ns | -10.09% |
| ⚡ | Simulation | bitwise_not_vortex_buffer_mut[128] |
273.6 ns | 244.4 ns | +11.93% |
| ⚡ | Simulation | compact[(4096, 90)] |
867.2 ns | 779.7 ns | +11.22% |
| ⚡ | Simulation | compare_int_constant |
298.4 µs | 268.5 µs | +11.12% |
Tip
Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.
Comparing codex/union-contract-correction (728422f) with develop (42bea5d)
Footnotes
-
42 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩
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