Incorrect type checking in catch operator

[Roaders]

RxJS version:
RXJS Version: 5.1.0

Code to reproduce:

interface Action = {
    type: string;
}

function loadTasks(){
    return this.service.load()
      .map<any[],Action>(_ => ({type:"TASKS_LOADED"}))
      .catch<Action,Action>((e: any) => Observable.of({broken:"True"}))
}

Expected behavior:
Given code should throw an error as {broken:"True"} cannot be converted to an Action

Actual behavior:
No Errors, code compiles fine

Additional information:
If I change the code to:

function loadTasks(){
    return this.service.load()
      .map<any[],Action>(_ => ({type:"TASKS_LOADED"}))
      .catch<Action,Action>((e: any) => Observable.of<Action>({broken:"True"}))
}

I get the expected error.

[lock]

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