`publish`'s `selector` doesn't have return type captured in generics in TypeScript

[benlesh]

RxJS version: 5.4.x

Code to reproduce:

const result: Observable<string> = of<number>(1, 2, 3).publish(source => source.map(x => x + '!'))
                                                                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Expected behavior:

No errors, proper type inferrence

Actual behavior:

error TS2345: Argument of type '(source: Observable<number>) => Observable<string>' is not assignable to parameter of type 'selector<number>'.
  Type 'Observable<string>' is not assignable to type 'Observable<number>'

Additional information:
TS 2.4

[lock]

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