Does RPM support >= for triggerpostun?

Issue

I've got a weird issue with RPM and triggerpostun script. In my spec file it contains:-

%triggerun -- sos < 1.0.2-0
...blah...

%triggerpostun -- sos >= 1.0.2-0
...blah...

Building the package for RHEL 5 and 6 on a RHEL 5 host does not generate any error or warning messages.

When I query the triggers of the package on a RHEL 5 host which has the following rpm version installed:-

# rpm -q rpm
rpm-4.4.2.3-34.el5.x86_64

I get the following results:-

triggerun scriptlet (using /bin/sh) -- sos < 1.0.2-0      ****  which is expected
...blah...

triggerpostun scriptlet (using /bin/sh) -- sos < 1.0.2-0      *** NOT expected, what happened to >=????
....blah...

When I query the triggers of the package on a RHEL 6 host it correctly shows the triggers:-

triggerun scriptlet (using /bin/sh) -- sos < 1.0.2-0

triggerpostun scriptlet (using /bin/sh) -- sos >= 1.0.2-0

Does RHEL 5 RPM not recognize the >= for trigger scriptlets?