For people migrating from version 4 to 5

[temeddix]

Now requestToRust Dart function will return null when the handler function in Rust cannot respond or has panicked. This is a breaking change, so when you upgrade to this version, you need to:

1. Run rinf template in the terminal and refactor some of the code where IDE warns you about mismatches.
2. Modify lib.rs and with_request.rs modules of the hub crate.

Refactoring your code shouldn't be too hard, since all of the warnings will be given by the IDE. This is not a seriously big change, so please refer to the documentation for further details, or ask here if you need any help.