Validation: stopOnFirstFailure should also stop after callbacks

[joelclermont]

If we set $stopOnFirstFailure = true, the intention is that all validation logic should stop once we encounter our first failure. I've noticed that after callbacks continue to run, however.

My desired behavior would be that stopOnFirstFailure would also prevent further after callbacks from running, whether it's something in rules that failed, or something in another after callback that failed.

Would there be support for this change? I'd be willing to submit a PR. I'm not sure if would be considered a breaking change or not either.

As a workaround, I have been adding a check for $validator->failed() inside my after callbacks.

Thanks!