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Rdatatable · Aug 29, 2024 · bcc1d77 · bcc1d77
1 parent 986a661
commit bcc1d77
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/utils.c b/src/utils.c
@@ -489,7 +489,8 @@ bool isDataTable(SEXP x) {
   return INHERITS(x, char_datatable);
 }
 
-// length(x) <= 1L || length(unique(lengths(x))) ==1L
+// rectangular list; NB does not allow length-1 recycling
+// length(x) <= 1L || length(unique(lengths(x))) == 1L
 static inline bool equalLens(SEXP x) {
   int n = LENGTH(x);
   if (n < 2)