* docs(multicast): mark primary signature as deprecated

* docs(publish): mark primary signature as deprecated

* docs(publishReplay): mark primary signature as deprecated

…duration selector (#5679)

* feat(groupBy): Support named arguments, support ObservableInputs for duration selector

- Adds support for named arguments.
- Adds support for returning promises, et al, from the duration selector.

NOTES:

* The tests for `groupBy` appear to be EXTREMELY old and outdated, and I was unable to updated them easily to use run mode. We may have to rewrite them all at some point to use better techniques. The issue seems to be a rudementary means of testing the inner observables that is incompatible with run mode.
* Docs still need updated
* Older paths still need to be deprecated
* dtslint tests need to be added

* chore: rebased. There are still type issues

* refactor: change to fn, options pattern

* chore: remove duplicate typing

missing import of interval

missing number$

…ublish`, `publishReplay` are now referentially transparent. Meaning if you take the result of calling `publish()` and pass it to N observable `pipe` methods, it will behave the same in each case, rather than having a cumulative effect, which was a regression introduced sometime in 6.x. If you required this broken behavior, there is a work around posted [here](#6410 (comment)) (#6410)

* fix(publish,publishReplay): resolve sharing Subject

change publish operator to use factory
change publishReplay operator to not share ReplaySubject
fixes issue #5411

* test: rearrange tests

* test: add failing ref transparency tests

* fix(publishBehavior): make ref transparent

* fix(publishLast): make ref transparent

* test: add failing ref transparency tests

* fix(share): make ref transparent

* chore: add a comment

* test: change descriptions and add comments

* refactor: destructure options outside of op func

* chore: use consistent terminology in comments

* test: use consistent terminology

Co-authored-by: Eli Davidson <[email protected]>

…sers to check whether a subject has current subscribers without us allowing access to the `observers` array, which is going to be made private in future versions. (#6405)

* feat(Subject): add isObserved() api

* fix(Subject): typo, remove done from sync test

* feat(subject): change observed method to property

* chore: update api_guardian files

Co-authored-by: Ben Lesh <[email protected]>