Yes I knew that. Not to sure which models but there where a few Apple laptops a while back that actually took more ram although not documented by Apple.
on that site it also says "However, Apple generally provides the official "maximum RAM" based on the highest capacity memory modules available at the time the system is shipped. Some systems later can be upgraded beyond this amount when higher-capacity modules become available. On the other hand, some other systems cannot be upgraded beyond the maximum originally stated by Apple."
So in the end it could be possible, now to see if any brave souls have tried it out.