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

首先阅读 concurrent.interpreters 中关于共享对象的文档，以及该模块现有的可共享 tuple 和 mapping 处理方式。确定当所有键和值都可共享时，如何实现 frozendict 的共享；完成的标准是支持的值无需 pickling 即可跨解释器传递，并且相关测试覆盖了这一行为。