[Yum-devel] yum can't count?

[Neal Becker]

cat /etc/yum/pluginconf.d/installonlyn.conf
[main]
tokeep = 4
enabled = 1

rpm -q kernel
kernel-2.6.15-1.1955_FC5
kernel-2.6.15-1.1969_FC5
kernel-2.6.15-1.1975_FC5

sudo yum upgrade
Loading "installonlyn" plugin
Loading "fastestmirror" plugin
Loading "changelog" plugin
Setting up Upgrade Process
Setting up repositories
[...]
Installing:
 kernel                  x86_64     2.6.15-1.1977_FC5  development        16 M
 kernel-devel            x86_64     2.6.15-1.1977_FC5  development       4.8 M
Updating:
[...]
Removing:
 kernel                  x86_64     2.6.15-1.1969_FC5  installed          81 M
 kernel                  x86_64     2.6.15-1.1955_FC5  installed          81 M
 kernel-devel            x86_64     2.6.15-1.1969_FC5  installed          14 M
 kernel-devel            x86_64     2.6.15-1.1955_FC5  installed          14 M

What am I not understanding here?  I said tokeep = 4, I think that means keep 
last 4 kernels.  If I have 1955, 1969, 1975 and install 1977, and remove 1955 
and 1969, then it's only keeping last 2, right?