Merged revisions 87750 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r87750 | r.david.murray | 2011-01-04 20:39:32 -0500 (Tue, 04 Jan 2011) | 5 lines

  #10790: make append work when output codec is different from input codec

  There's still a bug here (the encode call shouldn't use the 'errors'
  paramter), but I'll fix that later.
........
diff --git a/Doc/library/email.header.rst b/Doc/library/email.header.rst
index 1d530b2..796ac97 100644
--- a/Doc/library/email.header.rst
+++ b/Doc/library/email.header.rst
@@ -94,15 +94,15 @@
       decoded with that character set.
 
       If *s* is an instance of :class:`str`, then *charset* is a hint specifying
-      the character set of the characters in the string.  In this case, when
-      producing an :rfc:`2822`\ -compliant header using :rfc:`2047` rules, the
-      Unicode string will be encoded using the following charsets in order:
-      ``us-ascii``, the *charset* hint, ``utf-8``.  The first character set to
-      not provoke a :exc:`UnicodeError` is used.
+      the character set of the characters in the string.
 
-      Optional *errors* is passed through to any :func:`encode` or
-      :func:`ustr.encode` call, and defaults to "strict".
+      In either case, when producing an :rfc:`2822`\ -compliant header using
+      :rfc:`2047` rules, the string will be encoded using the output codec of
+      the charset.  If the string cannot be encoded using the output codec, a
+      UnicodeError will be raised.
 
+      Optional *errors* is passed as the errors argument to the decode call
+      if *s* is a byte string.
 
    .. method:: encode(splitchars=';, \\t', maxlinelen=None)