While testing the roadsigns demo with multiple pipeline steps, some steps would
fail because they contain unpickleable objects like csv readers. This change
filters them out before dumping the session - might be worth logging the fields
that were filtered so users aren't surprised by this.
See #81.
While testing the roadsigns demo with multiple pipeline steps, some steps would fail because they contain unpickleable objects like csv readers. This change filters them out before dumping the session - might be worth logging the fields that were filtered so users aren't surprised by this.