[wp-docs] serial comma?

[Barrett Golding]

does the Codex Doc Team have an opinion on: serial commas?
that last comma in a list before the "and":
http://en.wikipedia.org/wiki/Serial_comma

i.e.: I had lunch with my parents, President Obama and Queen Victoria.
vs.: I had lunch with my parents, President Obama, and Queen Victoria.

the latter makes it clear BHO & QE2 are not my parents.
so should we use serial comma when clarity demands,
but otherwise leave it up to author? or is there a Codex convention  
for its use?

thanks,
bg
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