matz	2007-12-23 02:28:20 +0900 (Sun, 23 Dec 2007)

  New Revision: 14498

  Modified files:
    trunk/ChangeLog
    trunk/io.c
    trunk/version.h

  Log:
    * io.c (rb_io_mode_enc): do not set encoding unless explicitly
      specified.
    
    * io.c (rb_io_check_readable): fill fptr->enc by default_external
      if it's empty.
    
    * io.c (io_enc_str): fptr->enc is always set for reading IO (by
      rb_io_check_readable(fptr)).

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/version.h?r1=14498&r2=14497
  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/ChangeLog?r1=14498&r2=14497
  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/io.c?r1=14498&r2=14497