Ensure inproc properly emulates serialization protocol #8622
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Ran into this again in #8612. Quite annoyingly, the InProc comm is not actually serializing stuff but is just emulating the behavior of the serialization protocol. This is nice because it should make our tests faster but it doesn't reflect reality since the ToPickle functionality is actually implemented on the serialization side, i.e. if we never serialize, the object stays untouched.
I could see how this fix also slows down the testsuite but I don't think we should just ignore this.