accept string types at the kernel side
accept string types at the kernel side

SylvainCorlay/bqplot,bloomberg/bqplot,ChakriCherukuri/bqplot,ChakriCherukuri/bqplot,dmadeka/bqplot,bloomberg/bqplot,bloomberg/bqplot,dmadeka/bqplot,SylvainCorlay/bqplot,SylvainCorlay/bqplot,ChakriCherukuri/bqplot