+ Magic differs from tieing and overloading in several ways :
+
+ * Magic isn't copied on assignation (as for blessed references) : you
+ attach it to variables, not values.
+
+ * It doesn't replace the original semantics : magic callbacks trigger
+ before the original action take place, and can't prevent it to
+ happen.
+
+ * It's mostly invisible at the Perl level : magical and non-magical
+ variables cannot be distinguished with "ref", "reftype" or another
+ trick.
+
+ * It's notably faster, since perl's way of handling magic is lighter
+ by nature, and there's no need for any method resolution.
+