Don't copy interior chunk boundaries in exterior boundaries.
Don't copy interior chunk boundaries in exterior boundaries.

freeman-lab/dask,pombredanne/dask,jayhetee/dask,esc/dask,jakirkham/dask,hainm/dask,mrocklin/dask,mrocklin/dask,ContinuumIO/dask,cpcloud/dask,ssanderson/dask,dask/dask,blaze/dask,jcrist/dask,PhE/dask,cowlicks/dask,marianotepper/dask,mikegraham/dask,hainm/dask,simudream/dask,wiso/dask,gameduell/dask,esc/dask,jcrist/dask,chrisbarber/dask,clarkfitzg/dask,jakirkham/dask,minrk/dask,mraspaud/dask,dask/dask,jayhetee/dask,simudream/dask,vikhyat/dask,PhE/dask,freeman-lab/dask,marianotepper/dask,blaze/dask,mraspaud/dask,wiso/dask,minrk/dask,ContinuumIO/dask,pombredanne/dask,vikhyat/dask,clarkfitzg/dask,ssanderson/dask