[clisp-list] bug? at least explanation sought

[<don...@is...>]

This probably only happens in #+unix and I so far only can
reproduce it when running clisp from an emacs shell buffer:

  Type :h and hit Enter for context help.                                                     

  [1]> 1
  2
  3
I use emacs to create three lines: I type 1, c-o, c-f, 2, c-o, c-f, 3
then enter to send it all

  1
  [2]> 2
  [3]> 3
as expected I get three top level events.

  [4]> (with-keyboard (read-char *keyboard-input*))
  y
  #S(SYSTEM::INPUT-CHARACTER :CHAR #\y :BITS 0 :FONT 0 :KEY NIL)

now try that again
  [5]> 1
  2
  3
  1
  [6]> 

and now the top level only sees the first line.

Outside of emacs I don't even know how to send three lines at once.

I see in src/keyboard.lsp that under #+unix with-keyboard sets *keyboard-input*,
but setting it back to nil does not make the multiple lines get read again.

So what's going on here?