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    Implement RxJS `mergeMap` through inner Observables to Subscribe and Pass Values Through

    rxjsRxJS
    ^6.0.0

    Understanding sources and subscribers makes it much easier to understand what's going on with mergeMap under the hood. Where a typical operator invokes destination.next directly, mergeMap wraps destination.next inside of a new source/subscriber combo so there's an "outer" next and an "inner" next.