In Facter 1.7 the operatingsystemrelease fact for Solaris operating systems has been changed like so:

[root@solaris1:/]# facter -v
1.6.18
[root@solaris1:/]# facter operatingsystemrelease
5.10

Versus the newer Facter:

[root@solaris2:/]# facter -v
1.7.1
[root@solaris2:/]# facter operatingsystemrelease
10_u11

Foreman creates a new Solaris OS object for Solaris 1011 where $major = 1011 and $minor is blank. It would seem that the code to split the major/minor versions is ignoring the _u and smashing the numbers together into the major version.

I haven't experiemented as yet, but I imagine that this causes problems with provisioning as well.