Message 339860 - Python tracker

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I think these ABI incompatible options are used many people.
But it is helpful to find extensions which using legacy APIs before Python 3.10 is released.

I had found ujson and MarkupSafe used legacy APIs.  I fixed MarkupSafe.
I don't care ujson because it is wrapper of wchar_t based C library
and there are enough json libraries.

I suppose there are some other packages in PyPI, but I'm not sure.