Add sanity check for accidentally passing two separate enhancers?

[markerikson]

I've occasionally seen people passing two separate store enhancers to createStore() (as seen in this SO question ). This is always an error, and it seems like we could add an additional sanity check to createStore() - probably just checking to see if we have 3 args, and if the second and third are both functions. (I would think we can safely assume that the preloadedState argument shouldn't be a function.) It's a rarer problem, but it's preventable.

Thoughts?

[selbekk]

I love it enough to create a PR for it :) Perhaps it's a bit too soon - but if nothing else, at least it made me read the source code of Redux for the first time.

Thanks for all your work and efforts on Redux @markerikson!