Cross-interpreter support for efficient sharing of frozendicts

Feature or enhancement

Proposal:

The concurrent.interpreters module for subinterpreters handles sharing/sending values across interpreters with direct sharing of some basic immutable types, and a fallback to pickling others. As an immutable container, tuples are supported (as long as all items are themselves shareable). Similarly, I think it would be good to support sharing frozendict without serialization (if keys & values are shareable).

Because dictionaries are so fundamental and common, having a better and more performant way to share such a mapping would significantly improve the experience of using concurrent.interpreters and InterpreterPoolExecutor.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

先閱讀 concurrent.interpreters 中關於共享物件的文件，以及該模組現有對可共享 tuple 和 mapping 的處理方式。確定當所有鍵和值都可共享時，如何實現 frozendict 的共享；完成的標準是支援的值無需 pickling 即可跨直譯器傳遞，且相關測試涵蓋了此行為。