Issue a warning when GET route declared before HEAD

I have spent several hours debugging a HEAD route and eventually found that I had fallen foul of the note here:
https://expressjs.com/en/4x/api.html#router.METHOD

A warning may not be the right approach, but it would be nice to be notified on a HEAD route declared after a GET that the GET logic would be called. I suspect I will be neither the first nor the last to have bashed their head against a wall over this one!