Background
I’m integrating the SPDX JSON-LD serializer into my SBOM generation pipeline, and I need to include CVSS v3 scores (type Double) on my CvssV3VulnAssessmentRelationship objects. The builder exposes a setScore(Double) method, but when the serializer encounters a Double it doesn’t know how to turn it into a JSON node, and throws an InvalidSPDXAnalysisException.

Current Behavior

• objectToJsonNode(...) handles String, Integer, Boolean, etc., but has no branch for Double.
• Any Double-typed field causes an exception.

Expected Behavior

• When an Object is a Double, it should be serialized as a DoubleNode.

Proposed Change

• update objectToJsonNode in JsonLDSerializer.java#L455-L477

 // … existing imports …
+import com.fasterxml.jackson.databind.node.DoubleNode;
 
 private JsonNode objectToJsonNode(Object object, …) {
     // … earlier branches …
     } else if (object instanceof Integer) {
         return new IntNode((Integer)object);
+    } else if (object instanceof Double) {
+        return new DoubleNode((Double)object);
     } else if (object instanceof IndividualUriValue) {
         …
     }
 }