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Based on django-picklefield which is
Copyright (c) 2009-2010 Gintautas Miliauskas
but some improvements including not deepcopying values.
Provides an implementation of a pickled object field.
Such fields can contain any picklable objects.
The implementation is taken and adopted from Django snippet #1694
by Taavi Taijala,
which is in turn based on Django snippet #513
by Oliver Beattie.
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