R Under development (unstable) (2024-02-29 r86017 ucrt) -- "Unsuffered Consequences"
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> library(SheetReader)
> options(stringsAsFactors = FALSE)
> data <- read_xlsx(system.file("extdata", "multi-test.xlsx", package = "SheetReader"), sheet="escape")
> stopifnot(colnames(data) == c("Escape", "This"))
> stopifnot(data[1, "This"] == "&")
> stopifnot(data[2, "This"] == "") # single apostrophe gets interpreted as empty by excel for some reason
> stopifnot(data[3, "This"] == "\"")
> stopifnot(data[4, "This"] == ">")
> stopifnot(data[5, "This"] == "<")
> stopifnot(data[6, "This"] == "What is < than \"\" & '>'")
> 
> proc.time()
   user  system elapsed 
   0.34    0.10    0.43