[issue24000] More fixes for the Clinic mapping of converters to format units

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Not according to the documentation.  'u' explicitly says it does not allow NUL characters.  'Z', 'u#', and 'Z#' all say they are "variants" of 'u' but never mention that they might allow NUL characters.

I understand the note in "u" description as explicitly saying that "u#" allows null characters.

The documentation for format units needs an update for other reasons and there is an issue with ready patch for this.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24000>
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