[issue40106] multiprocessor spawn

[B. L. Alterman]

B. L. Alterman <blaltermanphd at gmail.com> added the comment:

@Mouse, using "multiprocess" instead of "multiprocessing" will not work if you're passing a class that inherits from ABC.

"dill" is one of "multiprocess"'s dependencies and "dill" can't pickle an _abc_data object (https://github.com/uqfoundation/dill/issues/332)

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