'buffer' is a cross between the LPC array type and the LPC string type.  
'buffer' is intended as a way to conveniently manipulate binary data.  
'buffer' is not zero-terminated (that is, it has an associated length).  A 
'buffer' is an array of bytes that is implemented using one byte per 
element. buf[i] = x and x = buf[i] are allowed and do work.  sizeof(buf) 
works. bufferp(buf) is available.  buf[i..j] should work as well. buff = 
read_buffer(file_name, ...) (same args as read_bytes). also 'int 
write_buffer(string file, int start, mixed source)', buf = buf1 + buf2; 
buf += buf1, buf = allocate_buffer(size). The socket efuns have been 
modified to accept and return the 'buffer' type.   (STREAM_BINARY (3) and 
DATAGRAM_BINARY (4) modes.)