attempt to fix deep recursion error when pickling
attempt to fix deep recursion error when pickling

chrisbarber/dask,vikhyat/dask,jcrist/dask,jcrist/dask,jakirkham/dask,mikegraham/dask,blaze/dask,mrocklin/dask,dask/dask,dask/dask,cowlicks/dask,ContinuumIO/dask,mraspaud/dask,jakirkham/dask,blaze/dask,ContinuumIO/dask,vikhyat/dask,gameduell/dask,cpcloud/dask,mraspaud/dask,mrocklin/dask