[Rd] [PATCH] Three improvements to confint() documentation and S4 support

[Reed A. Cartwright]

I believe that what is being proposed here are changes to recent entries in
NEWS.Rd.

On Tue, Dec 30, 2025, 10:04 Aakriti Kushwaha <aakriti.kushwaha.ak using gmail.com>
wrote:

> Hello R developers,
>
>
> I would like to contribute three improvements to the R source:
>
>
>    1.
>
>    *S4 object support for **confint.default()*
>
>    -
>
>       confint.default() now works on S4 objects as long as suitable coef()
>       and vcov() methods exist.
>
>    2.
>
>    *substring()** and **substr()** improvements*
>
>    -
>
>       Both functions now accept i2 = NULL, allowing extraction until the
>       end of the string.
>       -
>
>       Improves convenience and aligns with user expectations.
>
>    3.
>
>    *Introduction of **%notin%** operator*
>
>    -
>
>       %notin% added as a base R idiom for !(x %in% table).
>       -
>
>       Enhances readability and avoids repeated negation in user code.
>
>
>
> *Motivation:*
>
>
>    -
>
>    Enhance S4 object compatibility.
>    -
>
>    Improve string handling convenience.
>    -
>
>    Provide a cleaner syntax for common negation of %in%.
>
>
> *Impact:*
>
>
>    -
>
>    Backward compatible; no breaking changes for existing S3 workflows.
>
>    The corresponding patch files are attached to this email.
>
>    I hope these changes are helpful. I look forward to any feedback or
>    suggestions you may have.
>
>
>    Thank you for your time and for maintaining R!
>
>
>    Best regards,
>
>    Aakriti Kushwaha
>
>    GitHub: aakritixyz <https://github.com/aakritixyz>
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