Also require setSpecProperty/setSuiteProperty args to be JSON serializable

src/core/util.js

@@ -80,9 +80,12 @@ getJasmineRequireObj().util = function(j$) {
     }
   };
 
-  util.assertStructuredCloneable = function(v, msgPrefix) {
+  util.assertReporterCloneable = function(v, msgPrefix) {
     try {
-      structuredClone(v);
+      // Reporter events are cloned internally via structuredClone, and it's
+      // common for reporters (including jasmine-browser-runner's) to JSON
+      // serialize them.
+      JSON.stringify(structuredClone(v));
     } catch (e) {
       throw new Error(`${msgPrefix} can't be cloned`, { cause: e });
     }