Allow adding blockers that don't create a beforeUnload event #949
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This allows adding blockers that don't create a beforeUnload event, so blocks can prevent or otherwise handle location changes but won't block reloading the page.
Normal blockers are looked at first (to support prompts), and then if they all allow the transaction the no-unload blockers are checked afterwards.
See #921 for reasoning (forcing a full page load for non-SPA routes). What are the maintainer's thoughts on this approach?