matz	2007-12-25 03:17:35 +0900 (Tue, 25 Dec 2007)

  New Revision: 14626

  Modified files:
    trunk/ChangeLog
    trunk/io.c

  Log:
    * io.c (rb_io_s_pipe): now takes up to two arguments.  allow its
      external/internal encoding by Encoding objects.
    
    * io.c (rb_io_set_encoding): new method to set encoding of the IO.
    
    * io.c (argf_set_encoding): ditto.

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/ChangeLog?r1=14626&r2=14625
  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/io.c?r1=14626&r2=14625