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Replace the shared allocator prototype with a bounded owner-thread cache. Validate allocator and drain safety with Miri, and measure randomized paired runtime and application workloads. Keep the feature disabled by default: native idle turns improve about 15%, but TCP workloads regress.
Make the PyLoop wrapper immutable and use stack-backed vectorcall arguments for ordinary task options. Preserve factory and eager-start compatibility paths. Add regression coverage and document the passing seven-workload timing/RSS holdout and Python 3.10, 3.14, and free-threaded checks.
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this will be merged on the release of Rust 1.100