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@MichalGniadek can I get your review here? Do you like the rename?

It looks like your PR is a breaking change, but you didn't provide a migration guide.

Could you add some context on what users should update when this change get released in a new version of Bevy?
It will be used to help writing the migration guide for the version. Putting it after a ## Migration Guide will help it get automatically picked up by our tooling.

Thanks @hooded-shrimp :D This change looks good, but needs a simple Migration Guide still. Let me know if you'd like a hand writing one :)

All the breaking changes should be recorded now.

This should probably also rename World::init_bundle to World::register_bundle?

This should probably also rename World::init_bundle to World::register_bundle?

I could do that.

World::init_bundle calls Bundles::init_info should that be renamed as well? There are also comments that might need to be updated to say "register" instead of "initialize".

Searched through init_ in the repo and:

• Components::init_component_inner could also be renamed as it's only used in the now renamed register_component and register_component_with_descriptor
• Components::init_resource, Components::init_non_send could also could be renamed (not the World methods though as these insert the resources automatically and not just register them)