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* Being a top level function in a module doesn't count as
hidden. This is no more hidden than collections.deque,
glob.glob, or re.sub.
* The API requirements are looser in a textwrap context. 
For a string method, there would need to be a universally
useful decision about how to handle mixed spaces and tabs
and whether the first line of a triple-quoted string would
be handled differently. Am not sure if universal newlines
present any additional issues.
* The world-view of the string module is character oriented,
not line oriented. A dedent method() is not a perfect fit.
* While the topic comes up every few years, in general,
there is no user demand for this.