Getting unexpected NSTaggedDate when pulling birthday properties from AddressBook?

Hello --

I am testing out pyobjc to perform some scripting on the Mac address book.
I'm trying to extend the provided exportBook.py script (
https://pythonhosted.org/pyobjc/examples/AddressBook/Scripts/exportBook/index.html)
to include several date fields such as birthdate. It looked to me like the
introspection model should allow me to simply add in additional field names:

FIELD_NAMES=(
('Last Name',  AddressBook.kABLastNameProperty),
('First Name', AddressBook.kABFirstNameProperty),
('E-mail',     AddressBook.kABEmailProperty),
('Birthday',   AddressBook.kABBirthdayProperty),
)

However the encodeField function returns an attribute error:
-----------------
    return value.encode('utf-8')
AttributeError: '__NSTaggedDate' object has no attribute 'encode'
-----------------

I'm not an Apple developer but some poking around on Google, StackExchange,
etc suggests that NSTaggedDate isn't typically a returned data type, and
the kABBirthdayProperty is supposed to be an NSDate property. This is
making me wonder if something when wrong with my pyobjc installation -- can
anyone suggest how best to debug this further?

Thanks in advance,

Ramon

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