NoerrCallToDo returns if we have the _exception case_, aka, func (noerr bool) where these handlers are called even normally only error handlers are called, i.e.

Pipeline is a helper to call several error handlers in a sequence.

PreProcess is currently used for err2 API like err2.Handle and .Catch.

Process executes error handling logic.

WorkToDo returns if there is something to process.

Wrapping is best default because we can be in the situation where we have received meaningful sentinel error which we need to wrap, even automatically.

Info tells to Process function how to proceed.