If you need to use a library crate that has a custom runtime with application callbacks (either via traits or closures), do you prefer it allows application-specific errors using generics or via Box<dyn Error + Send + Sync + 'static>?

I've mostly been using generics:

struct Error<E> {
  IO(std::io::Error),

  /// Application-defined error
  App(E)
}

Recently I've been reevaluating this for various reasons, but I'm curious what the general vibe in the community is.

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