Inaccuracy in documentation of ansi_substr

The documentation for ansi_substr states "works exactly like the original" but this is not true because it can't be used as a replacement function like base::substr. It would be nice to have this implemented. > packageVersion('cli') [1] '3.6.5' > x = '1234567890' > base::substr(x,3,5) [1] "345" > base::substr(x,3,5) = 'ABC' > x [1] "12ABC67890" > cli::ansi_substr(x,3,5) <cli_ansi_string> [1] ABC # But try as replacement: > cli::ansi_substr(x,3,5) = 'XYZ' Error: 'ansi_substr<-' is not an exported object from 'namespace:cli'