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I have a couple random remarks:
- now that FDs are non-inheritable by default, fork locks around
subprocess and multiprocessing shouldn't be necessary anymore? What
other use cases does the fork-lock have?
- the current implementation keeps hard-references to the functions
passed: so if one isn't careful, you can end up easily with a lot of
objects kept alive just because of those references, which can be a
problem
- also, since we're not sure about the API, and it's mostly intended
to be used for the interpreter/stdlib, how about making it private for
now, or at least "provisional' (I think that's the term)?
- I'm also +1 on exceptions in prepare hook preventing fork, but we'll
need to play a bit with actual fork hooks to see if that's a
reasonable approach