Nick Coghlan <ncogh...@gmail.com> added the comment:

Aye, what's in PEP 558 is the least invasive implementation change I've been 
able to come up that fixes the reported bug, but Nathaniel's right that it 
would break debuggers (and probably some other things) as currently written.

So the above design comes from asking myself "How can I get the *effect* of PEP 
558, while hiding what's going on internally even from trace function 
implementations?".

While I can't be sure until I've actually implemented it successfully (no ETA 
on that, unfortunately), I think blending my idea with Nathaniel's original 
idea will let us enjoy the benefits of both approaches, without the downsides 
of either of them.

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<https://bugs.python.org/issue30744>
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