I see no common symbols between #3102 and #3092, so unless I missed
something, they shouldn't be involved.

I second the notion that multiprocessing's use of pickle is the
triggering factor.  Registering so many types is ugly, and IMO it
shouldn't register anything it doesn't control.  We should either
register them global or not at all, and *never* as a side-effect of
loading a separate module.

I do see some win32-specific behaviour, which may be broken.  Thomas,
wanna try commenting out these two lines in sharedtypes.py:rebuild_ctype?

    if sys.platform == 'win32' and type_ not in copy_reg.dispatch_table:
        copy_reg.pickle(type_, reduce_ctype)