Protobuf Python has switched to upb as default backend since 21.0,
according to the release notes
<https://github.com/protocolbuffers/protobuf/releases/tag/v21.0>, which
significantly improves the performance. But according to notes here
<https://developers.google.com/protocol-buffers/docs/news/2022-05-06#python-updates>and
here
<https://developers.google.com/protocol-buffers/docs/reference/python-generated#sharing-messages>,
it implies the upb backend causes break when it shares messages between
Python and C++.
I'm a little bit confused here, as it can refer to 2 different situations,
A Python app uses C++ extension, which passes the protobuf message
objects between each other via function/class calls
A Python app and a C++ app transmit protobuf messages via
socket/pipe/etc., i.e., it needs to serialize/deserialize the messages
According to the following note
<https://developers.google.com/protocol-buffers/docs/reference/python-generated#sharing-messages>and
protobuf advertising it as language-neutral, I assume the break only
happens in the 1st situation, but want to double check that I'm not making
mistake here.
> Prior to Python 4.21.0, Python apps could share messages with C++ using a
native extension.
Thanks.
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