Previously, this would never actually return the Meta data structure
since by the time that it got parsed, we already knew that the request
was good. Now, we do a special parse when we know that it failed so
that we can return the structured data (in particular, we want to be
able to use the HTTP status code).
These fields aren't _returned_ with any member-related calls; however,
they are used when _adding_ a member to a group. For example, you can
add a member to a group by email address, but you need to set the "email"
property. Ditto for "phone_number".
Douglas Danger Manley