Cannot pickle (or jsonify) magma structures about magma HOT 1 OPEN

More information: I drilled down and maybe narrowed the problem to the ['_abc_impl'] component of the bit:
Example code:

import magma as m
import pickle

bit = m.In(m.Bit)
d = bit.__dict__
print(d)
pickle.dumps(d['_abc_impl'])

Example result of running code:

{
  'orig_name': 'Bit',
  '_info_': (Bit, <Direction.In: 0>),
  '__module__': 'magma.bit',
  '__doc__': None,
  '__abstractmethods__': frozenset(),
  '_abc_impl': <_abc_data object at 0x7f24490023f0>
}
Traceback (most recent call last):
  File "simple-example.py", line 7, in <module>
    pickle.dumps(d['_abc_impl'])
TypeError: cannot pickle '_abc_data' object

The error cannot pickle '_abc_data' object is a known long-standing problem with pickle, but they claim to have solved it: uqfoundation/dill#332

I tried their example (below) and did not get the error, so I guess they think it's fixed. But ours is still broken.

import dill
from abc import ABCMeta

class AbstractClass(metaclass=ABCMeta):
  pass

class ConcreteClass(AbstractClass):
  pass

dill.dumps(ConcreteClass)

The next step (if I were doing this) would be to find what's different between our abstract class and their example, and either fix our code or update their bug report. But I'm moving on to something else, so I'm hoping someone else might take up the cause...

from magma.