[issue20674] Update comments in dictobject.c

[Terry J. Reedy]

Terry J. Reedy added the comment:

Completely remove all reference to strings as it is normally completely wrong.  In three runs of
   list(map(hash, ("namea", "nameb", "namec", "named")))
I get
[-7801965690653662103, -712276634514874737, 4394438508544812081, -6975951345912708912]
[-1171799829, 419385606, 1995488749, 1433346153]
[551304887, -285234584, -553876274, -279423320]

Rewrite for ints only.

I am willing to apply, but cannot patch 3.4, so Raymond, if you want that, you will have to do it.

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nosy: +terry.reedy

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<http://bugs.python.org/issue20674>
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