Guido van Rossum added the comment:

In terms of how much freedom you have about changing the internal, I'd check 
how long ago they were changed.  "Internal" APIs that have been stable for many 
versions tend to have illicit external uses -- but internal APIs that were 
introduced recently (e.g. in 3.2) are usually safe to use -- nobody is going to 
make too much of a stink if you break their code.

As for saving f_globals, if you're going to save an extra pointer anyways, why 
not just save the frame pointer?

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<http://bugs.python.org/issue17911>
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