max unindent: indent-* with arg 0

[Dan Jacobson]

Gentlemen, it might be the case that indent-rigidly, indent-region,
etc. when called with an argument of zero, should remove all
indentation.

I mean I was dealing with these lines
       Hi.  I'm indented.
      Me too.
          Me three.
And thinking, must I resort to (query-replace-regexp "^\\s-+" "") or
isn't there some command called *-indent-* to handle it.
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