Dill fails to pickle avro.RecordSchema classes on Python 3.

Traceback (most recent call last):
File "/home/robbe/workspace/beam/sdks/python/apache_beam/io/avroio_test.py", line 432, in test_sink_transform
| avroio.WriteToAvro(path, self.SCHEMA, use_fastavro=self.use_fastavro)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/pvalue.py", line 112, in __or__
return self.pipeline.apply(ptransform, self)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/pipeline.py", line 515, in apply
pvalueish_result = self.runner.apply(transform, pvalueish, self._options)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/runners/runner.py", line 193, in apply
return m(transform, input, options)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/runners/runner.py", line 199, in apply_PTransform
return transform.expand(input)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/io/avroio.py", line 528, in expand
return pcoll | beam.io.iobase.Write(self._sink)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/pvalue.py", line 112, in __or__
return self.pipeline.apply(ptransform, self)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/pipeline.py", line 515, in apply
pvalueish_result = self.runner.apply(transform, pvalueish, self._options)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/runners/runner.py", line 193, in apply
return m(transform, input, options)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/runners/runner.py", line 199, in apply_PTransform
return transform.expand(input)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/io/iobase.py", line 960, in expand
return pcoll | WriteImpl(self.sink)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/pvalue.py", line 112, in __or__
return self.pipeline.apply(ptransform, self)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/pipeline.py", line 515, in apply
pvalueish_result = self.runner.apply(transform, pvalueish, self._options)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/runners/runner.py", line 193, in apply
return m(transform, input, options)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/runners/runner.py", line 199, in apply_PTransform
return transform.expand(input)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/io/iobase.py", line 979, in expand
lambda _, sink: sink.initialize_write(), self.sink)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/transforms/core.py", line 1103, in Map
pardo = FlatMap(wrapper, *args, **kwargs)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/transforms/core.py", line 1054, in FlatMap
pardo = ParDo(CallableWrapperDoFn(fn), *args, **kwargs)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/transforms/core.py", line 864, in __init__
super(ParDo, self).__init__(fn, *args, **kwargs)
File "/home/robbe/workspace/beam/sdks/python/apache_beam/transforms/ptransform.py", line 646, in __init__
self.args = pickler.loads(pickler.dumps(self.args))
File "/home/robbe/workspace/beam/sdks/python/apache_beam/internal/pickler.py", line 247, in loads
return dill.loads(s)
File "/home/robbe/workspace/beam/sdks/python/.eggs/dill-0.2.9-py3.5.egg/dill/_dill.py", line 317, in loads
return load(file, ignore)
File "/home/robbe/workspace/beam/sdks/python/.eggs/dill-0.2.9-py3.5.egg/dill/_dill.py", line 305, in load
obj = pik.load()
File "/home/robbe/workspace/beam/sdks/python/target/.tox/py3/lib/python3.5/site-packages/avro/schema.py", line 173, in __setitem__
% (key, value, self))
Exception: Attempting to map key 'favorite_color' to value <avro.schema.Field object at 0x7f8f72d0d0b8> in ImmutableDict {}

Traceback (most recent call last):
 File "/home/robbe/workspace/beam/sdks/python/apache_beam/io/avroio_test.py", line 308, in test_split_points
 self.assertEquals(split_points_report[-10:], [(2, 1)] * 10)
AssertionError: Lists differ: [(10, 1), (10, 1), (10, 1), (10, 1), (10, 1[42 chars], 1)] != [(2, 1), (2, 1), (2, 1), (2, 1), (2, 1), (2[32 chars], 1)]
First differing element 0:
(10, 1)
(2, 1)
+ [(2, 1), (2, 1), (2, 1), (2, 1), (2, 1), (2, 1), (2, 1), (2, 1), (2, 1), (2, 1)]
- [(10, 1),
- (10, 1),
- (10, 1),
- (10, 1),
- (10, 1),
- (10, 1),
- (10, 1),
- (10, 1),
- (10, 1),
- (10, 1)]