[racket] Problem with Racket REPL and pasting

> But if I copy and paste in the same expression, I get an error:
>> (+ 1 2
>    3)
> reference to undefined identifier: R


Confirmed: I can see similar behavior in DrScheme 4.2.5 when I
copy-and-paste in Windows 7:

###################################################################

C:\Program Files (x86)\PLT>mzscheme
Welcome to MzScheme v4.2.5 [3m], Copyright (c) 2004-2010 PLT Scheme Inc.
> (+ 1 2
   3)
reference to undefined identifier: M

 === context ===
C:\Program Files (x86)\PLT\collects\scheme\private\misc.ss:74:7
####################################################################


Quick experiment: I opened up a new Command Prompt terminal.  Ran
mzscheme, and then wrote the following at the REPL:

> (let loop () (printf "~s\n" (read-byte)) (loop))


I pressed enter.  I saw the following:

13
10

which is slightly unexpected, in the sense that I expected the reader
to have already absorbed the carriage-return+newline combination, but
oh well.  Then, with my clipboard containing the content:

(+ 1 2
    3)

I pasted into the command line console and pressed enter.  Here's what shows up:

(+ 1 2
40
43
32
49
32
50
32
13
10
   3)
77
32
32
51
41
13
10




The byte stream that's observed by read-bytes is the following:

> (bytes 40 43 32 49 32 50 32 13 10 77 32 32 51 41 13 10)
#"(+ 1 2 \r\nM  3)\r\n"



No clue why "M" is being introduced into the stream.  There's
something in the handling of newlines at the Windows console
interactive REPL that is funky.