Successive clicks on label are throttling OnChange listener

### Are you submitting a **bug report** or a **feature request**?

bug report

### What is the current behavior?

When a user clicks on a checkbox label, the event on the input is throttled causing the listening field stale to become stale.

### What is the expected behavior?

It should toggle quickly like clicking on the input directly does.

### Sandbox Link

https://codesandbox.io/s/zk2kmrwppm

Check both boys and girls then successively click the boys/girls label.

### What's your environment?

OSX, Node v8.11.1, npm 5.6.0

```
"final-form": "^4.10.0",
"react-final-form": "^3.6.5",
"react-final-form-listeners": "^1.0.1",
```

### Other information

This example is being used for another issue.