Array parameter for supplementary groups?

["Benjamin R. Haskell" <zsh@xxxxxxxxxx>]

Is there an array parameter for the group IDs of the current user?  Am I 
overlooking it?

Under Cygwin under Windows 7, right-click run-as-administrator adds some 
supplementary groups, but the user is otherwise indistinguishable, 
AFAICT.  I'd like to be able to do something like:

(( $+groups[(Re)0] )) && { do stuff for admin-style prompt }

without resorting to parsing the output of `id`.  (examples:)

running as normal:
uid=12522(bhaskell) gid=10513(Domain Users) groups=10513(Domain Users),545(Users)

running as admin:
uid=12522(bhaskell) gid=10513(Domain Users) groups=10513(Domain Users),0(root),544(Administrators),545(Users)

(I just dislike parsing when it's not necessary.)

--
Best,
Ben