Item Separator in inputBinding should be arbitrary string
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We should be able to use an arbitrary string as an item separator. This is to enable the use case where we have the command line being like -I a.txt -I b.txt -I c.txt
with the raw CWL being like
- id: input
type: 'File[]?'
inputBinding:
position: 0
prefix: '-I'
itemSeparator: ' -I '