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Oh, I think I understand why I'm confused--this is confusing
crap.  Can we put a table that maps the names appropriately
for those of us that don't know these things?  Something
like this (I don't know if it's correct, but you get the idea):

Darwin/0\..*  OS X 10.0
Darwin/1\..*  OS X 10.1
Darwin/2\..*  Does not exist
Darwin/3\..*  Does not exist
Darwin/4\..*  Does not exist
Darwin/5\..*  OS X 10.2
Darwin/6\..*  OS X 10.3
Darwin/7\..*  OS X 10.4