Problems with DateValidator (strftime raises TypeError as it gets unicode, not string)

Take a look at the following example:

from datetime import date
import formencode
since = formencode.All(
    formencode.validators.DateValidator(
        earliest_date = date(1995, 1, 1),
        latest_date = date.today(),
        ),
    formencode.validators.DateConverter(
        month_style = 'dd/mm/yyyy', not_empty=True, strip=True),
    )

since.to_python('10/12/2001')
# Above works correctly, returns datetime.date(2001,12,10)

since.to_python('strangetext')
# Also works correctly, raises formencode.api.Invalid

since.to_python('10/12/1991')
# buuuuuuum!!!!!

Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.4/site-packages/FormEncode-0.7.1-py2.4.egg/formencode/api.py", line 368, in to_python
    value = tp(value, state)
  File "/usr/lib/python2.4/site-packages/FormEncode-0.7.1-py2.4.egg/formencode/compound.py", line 57, in _to_python
    to_python)
  File "/usr/lib/python2.4/site-packages/FormEncode-0.7.1-py2.4.egg/formencode/compound.py", line 118, in attempt_convert
    value = validate(validator, value, state)
  File "/usr/lib/python2.4/site-packages/FormEncode-0.7.1-py2.4.egg/formencode/compound.py", line 15, in to_python
    return validator.to_python(value, state)
  File "/usr/lib/python2.4/site-packages/FormEncode-0.7.1-py2.4.egg/formencode/api.py", line 371, in to_python
    vp(value, state)
  File "/usr/lib/python2.4/site-packages/FormEncode-0.7.1-py2.4.egg/formencode/validators.py", line 827, in validate_python
    date_formatted = earliest_date.strftime(
TypeError: strftime() argument 1 must be str, not unicode


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