Join: travel through nested contexts recursively

[samber]

The recursive helper should travel recursively through nested errors when built with oops.Join(err1, err2, err3).

On collision of error attribute, we have priority rules. We use the deepest code, time, duration, domain...

When OopsError wraps multiple errors, how to change this rule?

[bauersimon]

From my experience just now, oops.Join only keeps the context from the first error, right?

https://go.dev/play/p/SSZHrzhUing

[samber]

Yes. We need some specification for this one.