LWG4427 meta::dealias needs to work with things that aren't entities

Author: burblebee

source/meta.tex

@@ -4894,12 +4894,9 @@
 \begin{itemdescr}
 \pnum
 \returns
-A reflection representing the underlying entity of what \tcode{r} represents.
-
-\pnum
-\throws
-\tcode{meta::exception} unless
-\tcode{r} represents an entity.
+If \tcode{r} represents an entity, then
+a reflection representing the underlying entity of what \tcode{r} represents.
+Otherwise, \tcode{r}.
 
 \pnum
 \begin{example}