Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

> As for pickling/copying, this task is technically difficult, 
> it but I don't see principal problems. 

I've added the pickle/copy support to the PR.

> is it worth to add it?

Tim was persuasive, so I've agreed to add the feature.  It may be little used 
but may help once in a while.

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