docs: fix and improve docstrings in three operators [Repo Assist]

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Summary

Three small but clear docstring issues identified in the operator implementation files:

1. _groupbyuntil.py — missing element_mapper in Args

The group_by_until_() function signature has four parameters, but the docstring Args section only documented three of them — element_mapper was silently omitted. Added the missing entry with a brief description.

2. _publishvalue.py — no docstring at all

publish_value_() was the only operator implementation function in the codebase without any docstring (102 others have one). Added a full docstring matching the project's style, describing the BehaviorSubject specialisation.

3. _tomarbles.py — docstring in wrong place + __all__ incomplete

• The docstring was on the inner closure (def to_marbles(source)) rather than on the outer factory function (def to_marbles(timespan, scheduler)). IDEs and tools such as help() read the outer function's docstring — moved it there and removed the now-redundant inner docstring.
• __all__ listed only ["stringify"], omitting to_marbles. Fixed to ["to_marbles", "stringify"] so from reactivex.operators._tomarbles import * exports the main function.

Changes

File	Change
reactivex/operators/_groupbyuntil.py	Added element_mapper to Args docstring
reactivex/operators/_publishvalue.py	Added full docstring to publish_value_()
reactivex/operators/_tomarbles.py	Moved docstring to outer function; added to_marbles to __all__

No logic changes. CI will validate via uv run ruff check, uv run pyright, and uv run pytest.

Note

🔒 Integrity filter blocked 50 items

The following items were blocked because they don't meet the GitHub integrity level.

• using timeout with GroupedObservable leads to an index shift #225 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Sort hot observable between (slow) scan executions #237 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Observable interval appears to leak #259 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Example noteboks are out of date #265 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Proposal for a subscribe scheduler #309 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Convert async iterator to Obervable #422 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Weird interaction between group_by and to_iterable? #467 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Q: how to use scheduler with subject for concurrency? #528 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• When using from_iterable with a generator the generator might not be closed #546 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Kivy scheduler is not in the library #560 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Exceptions get silently dropped when using from_iterable() #563 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• rx.timer works only with naive date object #574 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Adding Initial Value to Subject using start_with doesn't work for subscribe with AsyncIOScheduler #579 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• concat_map implementation or equivalent? #581 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Memory usage increases with subject and threadpool scheduler #582 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Connectable observable sends events multiple times #591 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• ... and 34 more items

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