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‘within(List, rm(x1, x2))’ works correctly again, including when ‘List[["x2"]]’ is ‘NULL’.
‘regexec(pattern, text, *)’ now applies ‘as.character(.)’ to its first two arguments, as documented.
S4 method dispatch on ‘...’ calls the method by name instead of ‘.Method’ (for consistency with default dispatch), and only attempts to pass non-missing arguments from the generic.
‘x <- 1:2; tapply(x, list(x, x), function(x) "")[1,2]’ now correctly returns ‘NA’. (PR#17333)