Bug 1598170 [wpt PR 20352] - Indexed DB: Verify array proxies are not…

… valid keys, a=testonly

Automatic update from web-platform-tests
Indexed DB: Verify array proxies are not valid keys (#20352)

Arrays of keys are valid keys, but implementations don't allow proxies of arrays to be keys. Add a test, corresponding to pending spec PR:

Bug: w3c/IndexedDB#309
PR: w3c/IndexedDB#311

--

wpt-commits: c65519066cf95e902607cce03a9057b859a50242
wpt-pr: 20352

testing/web-platform/tests/IndexedDB/key_invalid.htm

@@ -124,6 +124,8 @@
     var recursive3 = [recursive];
     invalid_key('array member contains self', recursive3);
 
+    invalid_key('proxy of an array', new Proxy([1,2,3], {}));
+
 </script>
 
 <div id=log></div>