-Magical values, tied values, and references can be made into
-constants at compile time, allowing for way cool stuff like this.
-(These error numbers aren't totally portable, alas.)
+The same effect can be achieved by omitting the value and the big
+arrow entirely, but then the symbol name must be put in quotes.
+
+ use constant "UNICORNS";
+
+The result from evaluating a list constant with more than one element
+in a scalar context is not documented, and is B<not> guaranteed to be
+any particular value in the future. In particular, you should not rely
+upon it being the number of elements in the list, especially since it
+is not B<necessarily> that value in the current implementation.
+
+Magical values and references can be made into constants at compile
+time, allowing for way cool stuff like this. (These error numbers
+aren't totally portable, alas.)