Type mismatch in Subject against Observable detected by typescript 2.4.1

[princemaple]

When compiling with typescript 2.4.1, ts detects a type mismatch in Subject, extending the Observable class, that implements lift with a different method signature

RxJS version: 5.4.1

Code to reproduce: no code required

Expected behavior: types do match

Actual behavior: they don't

Additional information:

ERROR in /var/build/node_modules/rxjs/Subject.d.ts (16,22): Class 'Subject<T>' incorrectly extends base class 'Observable<T>'.
  Types of property 'lift' are incompatible.
    Type '<R>(operator: Operator<T, R>) => Observable<T>' is not assignable to type '<R>(operator: Operator<T, R>) => Observable<R>'.
      Type 'Observable<T>' is not assignable to type 'Observable<R>'.
        Type 'T' is not assignable to type 'R'.

[kwonoj]

dupe of #2699 , #2539, #2700 . #2701 #2702

[princemaple]

Ah, sorry. Thanks!

[lock]

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