top reports wrong CPU number?

When I run top on my 4-way PPRo box, it shows the CPU numbers as 0, 1, 2,
and 4.  Before I send-pr this, is it expected behavior?  Here's a sample
(during build.sh -j5 distribution):

|load averages:  7.62,  7.72,  7.69
20:31:31
|81 processes:  2 runnable, 75 sleeping, 4 on processor
|CPU states: 79.8% user,  0.0% nice, 18.8% system,  1.3% interrupt,  0.1%
idle
|Memory: 73M Act, 128K Inact, 1536K Wired, 3668K Exec, 18M File, 363M Free
|Swap: 4612M Total, 4612M Free
|
|  PID USERNAME PRI NICE   SIZE   RES STATE      TIME   WCPU    CPU COMMAND
|20414 root      64    0   468K 1008K CPU/4      0:04 60.45% 17.87% nbmake
|17969 root      64    0   316K  852K CPU/0      0:02 69.68%  9.72% nbmake
| 3699 ratio     60    0   236K  940K CPU/2      3:54  6.01%  6.01% top
|19908 root      64    0   348K  912K CPU/1      0:02  2.83%  2.20% nbmake
|22461 root      64    0   416K  960K RUN/1      0:04 68.13% 17.68% nbmake

|überserver% uname -v
|NetBSD 1.6ZC (SERVER.MP) #0: Wed Oct  8 15:08:48 EDT 2003
ratio@überserver:/a/r
|atio/current/src/src/sys/arch/i386/compile/obj/SERVER.MP
|überserver% top -v
|top: version 3.5beta12
|überserver%

Thanks!

Bob