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bpo-35838: document optionxform must be idempotent (GH-12656)

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(cherry picked from commit 04694a306b)

Co-authored-by: Inada Naoki <songofacandy@gmail.com>
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Miss Islington (bot) 2019-04-02 02:29:16 -07:00 • committed by GitHub
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Doc/library/configparser.rst
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@ -723,6 +723,12 @@ be overridden by subclasses or by attribute assignment.
>>> list(custom['Section2'].keys())
['AnotherKey']
.. note::
The optionxform function transforms option names to a canonical form.
This should be an idempotent function: if the name is already in
canonical form, it should be returned unchanged.
.. attribute:: ConfigParser.SECTCRE
A compiled regular expression used to parse section headers. The default