Cleaned Data Different Access?

In a Form subclass, why do we have to use
self.cleaned_date['fieldname'] in the clean_fieldname() method and
self.cleaned_data.get("fieldname") in the clean() method for the form
overall? In the clean_fieldname() method, we're looking up the
cleaned python object / value in the cleaned_data dictionary of the
form. In the form's clean() method, it looks like we're pulling the
value from, as the documentation puts it, the final cleaned_data
attribute? Why the difference? At some point, we're no longer
getting a dictionary for cleaned data?

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