Some ideas for breaking changes:

• Hooks have very different parameters. Would be nice to unify that all of them accept a single state object. This makes it easier to add more properties in the future and makes it consistent.
• Allow beforeRequest hooks to proceed after updating request #387
• Remove some options from the normalized options passed to hooks. Like json. The types already do this, but the JS code was not in sync with the types.
• Timeout doesn't behave like documented #784