It means that the API for setting results/exceptions is essentially
private and may change. So if you use this you risk that your code
will break randomly at some point in the future when you upgrade
Python.
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The docs for this class state:
"Future instances are created by Executor.submit() and should not be
created directly except for testing."
https://docs.python.org/3/library/concurrent.futures.html#future-objects
We have a need for a thread-safe future type in our extension but this
statement make
