Philosophy of build numbers

[Shao Sean]

> I helps avoid the situation where you run out of space for numbers:
> what comes after OS X 10.3.9? Or 10.4.9? Or 10.9 - if the world is not

How would you run out of numbers?!  After 10.3.9 comes 10.3.10 ;-)  On 
a weird note I was looking into "version numbers" last week and read a 
nice article on Wikipedia:

http://en.wikipedia.org/wiki/Version

As regards to build numbers, I think using both is very handy, my eMac 
runs Mac OS X 10.3.9 (build 7W98) so you can see Apple uses both.. The 
build number isn't something that is normally visible to the end-user 
(they're heavily used during the testing stages though).