GeezerVison

Summary

• Call __ctypes_from_outparam__ for pure OUT parameters, honoring overrides and propagating lookup or conversion errors.
• Return the original object for IN/OUT parameters, instead of reading its .value.
• Keep output arguments alive throughout result construction and release the raw return value before output conversion callbacks.

Scope

The follow-on for supplied pure-OUT defaults has been reverted: a later argument converter can resize a default object's buffer after a raw pointer is captured, so that expanded path needs a separate buffer-lifetime solution. Existing implicit-OUT from_param and array handling, argument conversion/interleaving error order, and the errcheck argument tuple and snapshot timing also remain separate. The replacement-result decision is addressed independently by #9616.

Validation

• Compared with CPython 3.15.0 _build_result. CPython 3.15 libc time reproductions confirmed custom pure-OUT conversion and exception propagation, and IN/OUT identity.
• Independent source review and normal commit hooks (including rustfmt) passed. The final file diff was verified identical to the original reviewed commit after reverting the follow-on.
• RustPython was not built or executed locally. No tests were added or changed; hosted CI is expected to run existing ctypes tests.