Antoine Pitrou <pit...@free.fr> added the comment:

> I would like to update the `write_utf8` function but I would need to find a 
> way to wrap `const char* data` as a PyBytes instance without making a memory 
> copy to be able to pass it to my `_Pickle_write_large_bytes`. 

You should pass it as a memoryview instead:
https://docs.python.org/3/c-api/memoryview.html#c.PyMemoryView_FromMemory

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<https://bugs.python.org/issue31993>
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