Merge branch 'master' into ChristianWia-issue-#7251

Author: tdhock

GOVERNANCE.md

@@ -1,4 +1,4 @@
-Governance for the R data.table project
+# Governance for the R data.table project
 
 # Purpose and scope
 
@@ -121,7 +121,7 @@ Funds acquired by the data.table project will be disbursed at the discretion of
 
 # Code of conduct
 
-The full Code of Conduct can be found [here](CODE_OF_CONDUCT.md), including details for reporting violations.
+The full Code of Conduct can be found [here](.github/CODE_OF_CONDUCT.md), including details for reporting violations.
 
 ## Reporting Responsibility
 

R/fcast.R

@@ -186,11 +186,7 @@ dcast.data.table = function(data, formula, fun.aggregate = NULL, sep = "_", ...,
     maybe_err = function(list.of.columns) {
       if (!all(lengths(list.of.columns) == 1L)) {
         msg = gettext("Aggregating functions should take a vector as input and return a single value (length=1), but they do not, so the result is undefined. Please fix by modifying your function so that a single value is always returned.")
-        if (is.null(fill)) { # TODO change to always stopf #6329
-          stop(msg, domain=NA, call. = FALSE)
-        } else {
-          warning(msg, domain=NA, call. = FALSE)
-        }
+        stop(msg, domain=NA, call. = FALSE)
       }
       list.of.columns
     }