ConfigParser:

- don't allow setting options to non-string values; raise TypeError
  when the value is set, instead of raising an arbitrary exception
  later (such as when string interpolation is performed)
- add tests, documentation
(closes SF bug #810843)

Doc/lib/libcfgparser.tex

@@ -238,7 +238,9 @@ option in the given \var{section}.
 
 \begin{methoddesc}{set}{section, option, value}
 If the given section exists, set the given option to the specified value;
-otherwise raise \exception{NoSectionError}.
+otherwise raise \exception{NoSectionError}.  \var{value} must be a
+string (\class{str} or \class{unicode}); if not, \exception{TypeError}
+is raised.
 \versionadded{1.6}
 \end{methoddesc}