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Multiple input feature problem

I've encountered a problem using MultipleInputFeatureRequirement. It works with required inputs but not with optional inputs. Is this an expected behaviour and if so why?

All code to reproduce the problem and other information are here - https://github.com/AleksandrSl/cwl-problem-samples/tree/master/multiple_input_feature

cwl

I've found workaround for optional parameters using expressions,

source:
  - input_1
  - input_2
valueFrom: $([self[0], self[1]])

Nevertheless this behaviour looks like a bug

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