Sourced fromrxjs's changelog.

6.6.3 (2020-09-06)

Bug Fixes

• ReplaySubject: don't buffer next if stopped (#5696) (47d9e33)
• Ensure unsubscriptions/teardowns on internal subscribers are idempotent (#5465) (6d6a882), closes#5464

6.6.2 (2020-07-31)

Bug Fixes

• perf: Reduce memory pressure by no longer retaining outer values across the majority of operators. (#5613) (10cc8a6)

6.6.1 (2020-07-31)

Bug Fixes

• perf: Ensure unsubscriptions/teardowns on internal subscribers are idempotent (#5465) (6d6a882), closes#5464

6.6.0 (2020-07-02)

Bug Fixes

• asapScheduler: resolved memory leak (#5183) (4312af5), closes#5016
• fetch: don't leak event listeners added to passed-in signals (#5305) (06bf3a3)
• fromFetch: passing already aborted signal to init aborts fetch (c2657a8)
• pipe: Special handling for 0-arg case. (#4936) (2e9d867)
• pluck: operator breaks with null/undefined inputs. (#5524) (3bb2f7f)
• shareReplay: no longer misses synchronous values from source (d2f6ac7)
• interop: chain subscriptions from interop observables for 6.x (#5178) (cbc7721)
• shareReplay: clear subscription on shareReplay completion (#5044) (9f87505), closes#5034
• fromFetch: don't reassign closed-over parameter in fromFetch (#5234) (0377710), closes#5233#5233
• iterables: errors thrown from iterables now properly propagated (#5444) (2bce0e3)
• fromFetch: missing package.json in rxjs/fetch (#5001) (06fb735)

Features

• fromFetch: add selector (cherry pick#5306 for v6) (#5442) (3d6e4c5)

• a4bcb84 chore(publish): 6.6.3
• 47d9e33 fix(ReplaySubject): don't buffer next if stopped (#5696)
• 193e519 build(actions): cherry-pick gh actions to 6.x (#5582)
• 64e6bff docs(operators.md): fix grammar (#5637)
• 326a418 chore(publish): 6.6.2
• cddc925 Merge branch '6.x' of github.com:ReactiveX/rxjs into 6.x
• ca6a3a1 chore(publish): 6.6.1
• 10cc8a6 refactor: Improve memory pressure (#5613)
• 075af28 docs: fix import in timeoutWith example
• 6d6a882 fix: Ensure unsubscriptions/teardowns on internal subscribers are idempotent ...
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