In an attempt to overcome #20 (using the same general example as in #33) I have moved the scatter down to the lowest level. However, I found that when building a filename with valueFrom inside the scatter that it returns undefined.

steps:
  foo:
    run: foo.cwl
    scatter: input_file
    in: 
      input_file: input_files
      output_filename:
        valueFrom: ${return inputs.input_file.nameroot + ".out";}
    out:
      [output_file]

However, this is not reproducible in cwltool where the filename gets correctly built. This seems like a cwlexec specific issue, but it could also be that I am not using best practices when building a string from within a scatter.

UndefinedFile.tar.gz