does not work with extra fields of type 'A'

[abhinav]

I had been retrieving only empty strings for extra fields of type 'A' with the most recent commit to master. The pull request #18 introduces retrieval of such char-type fields. I think it's a comprehensive fix, but docs still have to be regenerated.

[Brent Pedersen]

thanks for the fix. I'll close when I regenerate the docs.