Probably not a big deal, but, well, most likely worth mentioning:
GL Spec since 3.1 says that MAX_CLIP_DISTANCE should be atleast 8, but current drivers and for as long as I can remember, nVidia drivers have always given 6.
Just out of curiosity, is this a hardware limit kind of deal or just no one has spotted/cared before?
Actually there is something really screwball in the spec:
for GL 3.2. core spec (version data 20090803) I see in Section 21.9 (page 97):
This view volume may be further restricted by as many as n client-deﬁned half-
spaces. (n is an implementation-dependent maximum that must be at least 6.)
but in Section G.2 (page 343)
Update MAX_CLIP_DISTANCES from 6 to 8 in section 2.19 and table 6.37,
to match GLSL (bug 4803).