In devtools::check() is the warning "Portable packages must use only ASCII characters in their R code" valid for string content inside packageStartupMessage()?

Package development
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I have created simple packageStartupMessage() messages with characters such as ç, ã, õ and ú inside a .onAttach function. Should the devtools::check() function really display the "Portable packages must use only ASCII characters in their R code" warning?

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As mentioned in Chapter 7 R code | R Packages you should only place ASCII characters in code.

Fixed code placing problematic text within cat(stringi::stri_escape_unicode()) to generate ASCII accepted text and later placed output inside packageStartupMessage(stringi::stri_conv()) within code. Notice the new stringi::stri_conv() function being used.

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