Mark Shannon <m...@hotpy.org> added the comment:

Another use of this is to add watch points in debuggers.

To that end, it would better if the callback were a Python object.

The overhead is relatively small if using the vectorcall protocol.
If the call overhead matters that much, there is something wrong as way too 
many callbacks are happening.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46896>
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