chai immutable equality testing issue in browser(karma)

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reducer_spec.js fails in browser (karma) testing...the problem is in the chai equality testing on iterables...Map...my fix is to use chai-immutable, which (I guess) was originally intended (as shown in package.json) but not implemented for whatever reason...

Maybe there's some other way to configure karma to make it work, but it appears it is more straightforward to use chai-immutable instead...