common-workflow-language
                                
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                        records fields missing default value option
http://www.commonwl.org/v1.0/CommandLineTool.html#CommandInputRecordSchema
👍  - however I don't really see how a default value could be useful at all. The only plausible default value for this would be [] - I can't see how this would be useful. I think more useful behaviour would be for the empty record type to act like a map, with no constraints.
This issue has been mentioned on Common Workflow Language Discourse. There might be relevant details there:
https://cwl.discourse.group/t/creating-config-json-file-from-a-record/172/3