Even more decorators do not check their input type

Hi,

from formencode.validators import Number
Number().to_python([])
Traceback (most recent call last):
(...)
TypeError: float() argument must be a string or a number

As so many validators are lacking type checking and assume that their
input is a string, I think all existing validators should be reviewed if
they do check their inputs sanely. Maybe it's even justified to subclass
validators.String instead of FancyValidator directly...

fs


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