PEP 678: add post-history, minor tweaks following discussion (#2294)

pep-0678.rst

@@ -2,13 +2,14 @@ PEP: 678
 Title: Enriching Exceptions with Notes
 Author: Zac Hatfield-Dodds <[email protected]>
 Sponsor: Irit Katriel
+Discussions-To: https://discuss.python.org/t/pep-678-enriching-exceptions-with-notes/13374
 Status: Draft
 Type: Standards Track
 Content-Type: text/x-rst
 Requires: 654
 Created: 20-Dec-2021
 Python-Version: 3.11
-Post-History:
+Post-History: 2022-01-27
 
 
 Abstract
@@ -111,7 +112,7 @@ exception includes a note of the minimal failing example::
 Non-goals
 ---------
 ``__note__`` is *not* intended to carry structured data.  If your note is for use by
-a program rather than display to a human, we recommend instead choosing a convention
+a program rather than display to a human, we recommend instead (or additionally) choosing a convention
 for an attribute like e.g. ``err._parse_errors = ...`` on the error or ``ExceptionGroup`` [1]_ [2]_
 
 As a rule of thumb, prefer `exception chaining <https://docs.python.org/3/tutorial/errors.html#exception-chaining>`__
@@ -276,10 +277,14 @@ to include other objects is fully backwards-compatible.  In the absence of any p
 use-case (see also `Non-goals`_), we prefer to begin with a restrictive API that can
 be relaxed later.
 
+We also note that converting an object to a string may raise an exception.  It's more helpful
+for the traceback to point to the location where the note is attached to the exception,
+rather than where the exception and note are being formatted for display after propagation.
+
 
 Add a helper function ``contextlib.add_exc_note()``
 ---------------------------------------------------
-It was suggested that we add a utility such as the one below to the standard
+It was suggested [11]_ that we add a utility such as the one below to the standard
 library. We are open to this idea, but do not see it as a core part of the
 proposal of this PEP as it can be added as an enhancement later.
 
@@ -323,6 +328,7 @@ References
 .. [8] https://github.com/python/cpython/pull/28569#discussion_r721768348
 .. [9] https://bugs.python.org/issue45607
 .. [10] https://github.com/python/cpython/blob/69ef1b59983065ddb0b712dac3b04107c5059735/Lib/http/client.py#L596-L597
+.. [11] https://www.reddit.com/r/Python/comments/rmrvxv/pep_678_enriching_exceptions_with_notes/hptbul1/