* transcode.c (str_encode_bang, encoded_dup): if nothing was
transcoded, just set encoding but leave coderange unchanged as
forcee_encoding. [ruby-core:43557][Bug #6190]
* transcode.c (documentation for str_encode): Explain
that transcoding to the same encoding is a no-op
(i.e. no exceptions, no replacements,...).
[ruby-core:43557][Bug #6190]
merge revision(s) 35112,35121: [Backport #6190]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@40056 b2dd03c8-39d4-4d8f-98ff-823fe69b080e