close #2375: coerce character values to logical for chunk options `me…

…ssage` and `warning`

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: knitr
 Type: Package
 Title: A General-Purpose Package for Dynamic Report Generation in R
-Version: 1.48.8
+Version: 1.48.9
 Authors@R: c(
     person("Yihui", "Xie", role = c("aut", "cre"), email = "xie@yihui.name", comment = c(ORCID = "0000-0003-0645-5666")),
     person("Abhraneel", "Sarma", role = "ctb"),

NEWS.md

@@ -24,6 +24,8 @@
 
 ## MINOR CHANGES
 
+- If a character value is passed to the chunk option `message` or `warning`, it will be coerced by `as.logical()`, e.g., a character string `"NA"` will be coerced to `NA` (thanks, @cderv, #2375).
+
 - Changed the format of the reference card from PDF to HTML so building this package will not require LaTeX. See `vignette('knitr-refcard', package = 'knitr')`.
 
 - Switched the vignette engine from **knitr** to `litedown::vignette` for some package vignettes.

R/utils.R

@@ -276,6 +276,10 @@ dash_names = function(x) {
 fix_options = function(options) {
   options = as.strict_list(options)
 
+  # message/warning take logical or numeric values; if character, convert to logical
+  for (i in c('message', 'warning')) {
+    if (is.character(options[[i]])) options[[i]] = as.logical(options[[i]])
+  }
   # if you want to use subfloats, fig.show must be 'hold'
   if (length(options$fig.subcap)) options$fig.show = 'hold'
   # if the animation hook has been set, fig.show must be 'animate'