Override widget for TextFields on Admin site

Is there an easy way to get the Admin site to use an
<input
type="text"> for a TextField rather than a
<textarea>? In my model I
have fields that do not have an upper bound on its length,
so
CharField is not appropriate, but do not benefit from having
a multi-
line edit box.

It looks like the Admin site will call the ChangeManipulator
class
method on my model. That looks promising, but the
documentation on
oldforms is pretty sparse, and I'm not sure what the correct
way to
override it would be.
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