Thanks for the fix, it works for my use case. (btw that was
    #define U(...) __VA_ARGS__
and not what I wrote).

> I don't think that PR 24533 should be backported to Python 3.8 and Python 3.9. I prefer to avoid any risk of regression, and so only change Python 3.10.

> For Python 3.9 and older, a workaround is to wrap the call to PyObject_TypeCheck() with your own static inline function.

For Python 3.8 that fix wouldn’t be needed as the `tp` argument was parenthesised in the macro.

Yet... the first argument is still unshielded, passed to a macro that expects one single macro argument. That’s not a regression, it wasn’t shielded in 3.8 either, but why not just parenthesise each macro argument that denotes an expression (as opposed to e.g. name)?