Binary packages vs. OS release

[Makoto Fujiwara <makoto%ki.nu@localhost>]

Hi, first of all, I have (a little bit) silly question.

I've been running pbulk bulkbuild for NetBSD/amd64.

for
9.0_BETA
9.0_RC1
9.0_RC2
9.0      ... still running for the first one.

As natural, I'm using the binary package repository for sysinst first pkgin
installation, and usual pkgin operation.

By the way, say, for 9.0_RC2 the first installation, only the RC1 packages
are available (just of my personal experience). So I was using one
generation older packages. I've got so many warnings with this, package by
package for this packages is for RC1 but your OS is of RC2.

On the contrary, when I was running the very first 9.0 installation
(sysinst and also later pkgin install), I'm using for RC2 packages. But at
that time, I had not such warning at all.

My question is:
  Is this an expected behavior ?

Thanks,
-- 
Makoto Fujiwara
mef%NetBSD.org@localhost
makoto%if.t.u-tokyo.ac.jp@localhost
Key fingerprint = 0BFA FAEB EAD1 90BA 7498  8F85 6809 9E0B B7EF A12E