[issue43503] [subinterpreters] PyObject statics exposed in the limited API break isolation.

[Eric Snow]

New submission from Eric Snow <ericsnowcurrently at gmail.com>:

In the limited C-API we expose the following static PyObject variables:

* 5 singletons
* ~70 exception types
* ~70 other types

Since they are part of the limited API, they have a direct effect on the stable ABI.

The problem is that these objects should not be shared between interpreters.  There are a number of possible solutions for isolating the objects, but the big constraint is that the solution cannot break the stable ABI.

----------
components: C API
messages: 388759
nosy: eric.snow
priority: normal
severity: normal
stage: needs patch
status: open
title: [subinterpreters] PyObject statics exposed in the limited API break isolation.
type: behavior
versions: Python 3.10

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<https://bugs.python.org/issue43503>
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