Export API: https://docs.python.org/3.14/c-api/long.html#export-api
PyLongWriter API: https://docs.python.org/3.14/c-api/long.html#pylongwriter-api

We already have PyLong_FromNativeBytes()/PyLong_AsNativeBytes() (much more complex internally than PEP 757 API) to import/export big integers, but these functions aren't suitable for fast conversions between different big integer types. I think it's major obstacle for (eventually) using Limited API in the gmpy2.

Vote:

• @erlend-aasland
• @encukou
• @serhiy-storchaka (inactive)
• @vstinner
• @zooba