More JSON5 test cases

Author: mikera

convex-core/src/test/java/convex/core/utils/JSONUtilsTest.java

@@ -85,9 +85,11 @@ public void testParse() {
 		assertThrows(ParseException.class,()->JSONUtils.parse("{"));
 		assertThrows(ParseException.class,()->JSONUtils.parse("3]"));
 		assertThrows(ParseException.class,()->JSONUtils.parse("[,]"));
+		assertThrows(ParseException.class,()->JSONUtils.parse("{,}"));
 
 		// Trailing commas allowed
 		assertEquals(JSONUtils.parse("[3]"),JSONUtils.parse("[3,]"));
+		assertEquals(JSONUtils.parse("[1, 3]"),JSONUtils.parse("[1,3, ]"));
 		assertEquals(JSONUtils.parse("{\"foo\":1}"),JSONUtils.parse("{\"foo\":1,}"));