secondaryFiles has Dirent, not Directory.

Peter Amstutz · Peter Amstutz · commit 56ef87ab7a75 · 2016-06-28T16:59:56.000-04:00
diff --git a/draft-4/Process.yml b/draft-4/Process.yml
@@ -144,8 +144,7 @@ $graph:
       type:
         - "null"
         - type: array
-          items: "#File"
-        - Directory
+          items: [File, Dirent]
       jsonldPredicate: "cwl:secondaryFiles"
       doc: |
         A list of additional files that are associated with the primary file
