Re: validators.String validates []

Another weird thing:
 >>> from formencode.validators import UnicodeString, String
 >>> String().to_python([])
[]
 >>> UnicodeString().to_python([])
u''

Furthermore, I think there is a bug in UnicodeString:
 >>> UnicodeString().to_python([1, 2])
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
   File "/usr/lib/python2.4/site-packages/formencode/api.py", line 368, in to_python
     value = tp(value, state)
   File "/usr/lib/python2.4/site-packages/formencode/validators.py", line 1069, in _to_python
     return unicode(value, self.inputEncoding)
TypeError: coercing to Unicode: need string or buffer, list found

As validators are often used on untrusted input, I thought that validators should only
raise Invalid exceptions.

fs

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