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stale_copy() uses copy.deepcopy() for non-primitive objects, such as those returned by django-jsonfield. This is quite slow, and could be sped up, as explored by e.g. http://technology.jana.com/2014/12/29/json-deep-copy/.

I didn't want to put together a pull request until the maintainers were happy with a proposal for speeding this up. So, would you be interested in a PR implementing the approach in the blog article above? (e.g. try round-tripping with ujson, then json, then copy.deepcopy()?

Another alternative would be to special-case JSONField fields to use a [u]json round-trip, and leave everything else to use copy.deepcopy(). I worry that this would be a bit too ugly though.

Hey guys,

The version published on PyPi (0.85) throws an Exception when installing the requirements in a new environment. I believe that 42d3bc7#diff-99ea59348ff4d82b0c18fa667516bc40L21 (just after 0.85) fixes that. Can you do a new release for this?

Thanks for your time and for a great package!