Avoid a narrowing warning via explicit cast

[eddelbuettel]

Brian Ripley runs his M1mac checks under clnag++ with options -Wall -pedantic -Wconversion -Wno-sign-conversion and this throws up some narrowing warnings. This minimal PR suppresses one where C++ size() returns long int and R wants an int.

Checklist

• Code compiles correctly
• R CMD check still passes all tests
• Preferably, new tests were added which fail without the change
• Document the changes by file in ChangeLog

[Copilot]

Pull Request Overview

This PR addresses a narrowing warning that occurs when compiling with clang++ using strict warning flags. The issue arises because std::string_view::size() returns a size_t (which can be long int) but the R function Rf_mkCharLen() expects an int parameter.

• Added explicit cast from size_t to int to prevent narrowing warning
• Updated ChangeLog to document the fix

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

File	Description
inst/include/Rcpp/internal/wrap.h	Added explicit cast to suppress narrowing warning in make_charsexp__impl__cstring function
ChangeLog	Documented the narrowing warning fix

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[Enchufa2]

LGTM!