add test for big json number with fetch/xhr

src/main.zig

@@ -862,7 +862,7 @@ fn testHTTPHandler(req: *std.http.Server.Request) !void {
     }
 
     if (std.mem.eql(u8, path, "/xhr/json")) {
-        return req.respond("{\"over\":\"9000!!!\"}", .{
+        return req.respond("{\"over\":\"9000!!!\",\"updated_at\":1765867200000}", .{
             .extra_headers = &.{
                 .{ .name = "Content-Type", .value = "application/json" },
             },

src/tests/fetch/fetch.html

@@ -12,7 +12,8 @@
   });
 
   testing.async(promise1, (json) => {
-    testing.expectEqual({over: '9000!!!'}, json);
+    testing.expectEqual("number", typeof json.updated_at);
+    testing.expectEqual({over: '9000!!!',updated_at:1765867200000}, json);
   });
 </script>
 
@@ -29,6 +30,7 @@
   });
 
   testing.async(promise1, (json) => {
-    testing.expectEqual({over: '9000!!!'}, json);
+    testing.expectEqual("number", typeof json.updated_at);
+    testing.expectEqual({over: '9000!!!',updated_at:1765867200000}, json);
   });
 </script>

src/tests/xhr/xhr.html

@@ -65,6 +65,8 @@
     testing.expectEqual(200, req3.status);
     testing.expectEqual('OK', req3.statusText);
     testing.expectEqual('9000!!!', req3.response.over);
+    testing.expectEqual("number", typeof req3.response.updated_at);
+    testing.expectEqual(1765867200000, req3.response.updated_at);
   });
 </script>