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[rhettinger]
> Perhaps, the set() method should coerce to a string rather
> than test for it.

Perhaps.  But regardless of whether it's a test or coercion,
if it's in RawConfigParser.set, it prevents non-string use.
Perhaps ConfigParser.set should extend RawConfigParser.set
with the string test or coercion, leaving
RawConfigParser.set as it was before rev 1.65.

That may be the best solution.