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[kotlin-redux 1.4.0-rc] kotlin-redux can't create store using new IR JS backend

See original GitHub issue

Trying to create a store with the kotlin-react code, but it fails when using the new IR js backend (kotlin.js.compiler=ir)

Repo here: https://github.com/JWood48/KotlinTests see sub project kotlin-react-redux-test

code:

 @Test
    fun reduxTest() {

        data class TestState(val msg: String)

        class TestAction : RAction

        fun testReducer(state: TestState, action: RAction) : TestState = when (action) {
            is TestAction -> state.copy(msg = state.msg+"1")
            else -> state
        }

        val store = createStore(::testReducer, TestState("TEST_"), rEnhancer())

    }

fails with

´´´ Uncaught TypeError: action._get_action__0 is not a function ´´´

Works if disabling the new ir js backend

NOTE: The example in the repo is based on https://github.com/lawik123/kotlin-poc-frontend-react-redux