Serial number zero and sequence space arithmetic

[Peter Koch]

Hi,

> It looks to me from the 4.9.3 source like sequence space
> arithmetic came in at about 4.9.  (I don't have any 4.9 source
> older than 4.9.3, and 4.8.3 doesn't appear to use sequence
> space.)  Can anyone confirm this?

my oldest available copy is a snapshot of 4.9 dated 1993-02-02.
Excerpt from that day's named-xfer.c:

	/* compare using sequence space arithmetic */
	if (SEQ_GT(zp_start.z_serial, serial_no) || serial_no == 0) {

-Peter