beforeEach behaviour check

[stevoland]

Summary

According to the docs beforeEach is called before each story mount. Empirically I note that:

a) it is also called before every re-render of the story - ie: when args update
b) a returned cleanup function is only called after the story is unmounted - not before subsequent beforeEach calls on re-renders

This means each beforeEach needs to handle an environment where it has already been run on the current story.

1. Are both a) and b) are as designed?
2. Is there or should the be a way for beforeEach code to know whether it has already run on the current story
3. Should the docs be clarified on these points?

Thanks!

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