On Fri, Jan 9, 2009 at 12:19 AM, Alek Storm <alek.st...@gmail.com> wrote:

> Kenton, do all composite fields in extensions have
> to be optional?  If so, can we document this?

Extensions must be optional or repeated, since a required extension doesn't
make sense.  I'm pretty sure the compiler checks this.  If not, that's a

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