get-bytes in editor-stream-in%

Like get-unterminated-bytes, but the last read byte is assumed to be a nul terminator and discarded. Use this method when data is written by a call to put without an explicit byte count, and use get-unterminated-bytes when data is written with an explicit byte count.

• (send an-editor-stream-in get-bytes len) -> byte string or #f
   len = #f : boxed exact non-negative integer or #f

  The len box is filled with the length of the byte string plus one (to indicate the terminator), unless len is #f.