STINNER Victor <vstin...@python.org> added the comment:

Make PyObject an opaque structure is also a first step towards the more 
ambitious project "HPy" project which is fully opaque:
https://github.com/pyhandle/hpy

This API is written from scratch and currently implemented on top on the 
existing C API.

The following article is a nice introduction to the overall idea:
https://morepypy.blogspot.com/2019/12/hpy-kick-off-sprint-report.html

>From my point of view, the long term goal would be to get better performance 
>on PyPy and having a single API for C extension which would be efficient on 
>all Python implementations (not only CPython).

Currently, the C API is not only a performance issue to run C extensions on 
PyPy. It's also an issue in CPython. Because the C API leaks too many 
implementation details, we cannot experiment optimizations.

See also: https://pythoncapi.readthedocs.io/rationale.html

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