Suggestion: Allow reacting to search params and fragment changes on the client side

[agj]

Some way to react within the route itself to changes in the URL involving search params (?) and the fragment (#). Something like Elm Land's Page.withOnUrlChanged, although I haven't used that personally.

My personal use case is that I have a static blog built with elm-pages, and one page is the tag page, which uses a ?t=tag query to list posts matching a tag. I was able to do this with v2 because when the URL changed, the page re-initted, so the model was rebuilt.