[yeongseon]

Summary

Prepare static body TypeAdapters once for default Pydantic decorators without changing the custom adapter API.

Changes

Keep one private model-identity/adapter pair per default decorator. Direct adapter calls and supplied custom adapters retain existing parsing behavior; query still uses model_validate. Failed preparation preserves request-time behavior. Add failing-first no-reconstruction regression and custom body/query compatibility control, plus repeatable benchmark and cost documentation.

Validation

Python 3.11 make check-all build: 811 passed, 27 deselected, 4 warnings in 18.12s; coverage 97.22%. Benchmark (Python 3.11.15/Pydantic 2.14.1, minimum of five 10k runs): small model 5.638 to 0.728 us; nested 6.223 to 1.225 us; union 75.183 to 1.000 us. Adapter-only, not HTTP latency. Existing cross-handler, custom backend and worker tests pass. GitHub CI pending.

Related Issues

Closes #595

Merge authorized by the maintainer’s explicit instruction.

[yeongseon]

Merge authorized by the maintainer’s explicit instruction. Reviewed per-decorator ownership, model identity guard, custom-adapter bypass and benchmark limits. Exact head 356fbe6: five required contexts completed=success, no unresolved threads. Local summary: 811 passed, 27 deselected, 4 warnings in 18.12s; 97.22% coverage.