keep filenames state for performance
keep filenames state for performance

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