Stripping spaces from text fields in forms (forms.TextField)

Stripping leading and trailing whitespace from text fields
in forms in
nearly always desirable, but Django doesn't handle this for
me.
There seems to be a hook built in for massaging input data
before it's
validated: FormField.prepare(). I tried subclassing
TextField like so:

class MyTextField(django.forms.TextField):
    def prepare(self, new_data):
        new_data = new_data.strip()

But since strings are passed by copy, this has no effect.

Any suggestions?
Do you think this functionality should be built into Django?


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