we can use the MOP to add coercers

Author: gfldex

doc/Language/typesystem.pod6

@@ -59,7 +59,8 @@ Turning one type into another is done with coercion methods that have the same
 name as the target type. This convention is made mandatory by
 L<Signatures|/type/Signature#Coercion_Type>. The source type has to know how to
 turn itself into the target type. To allow built-in types to turn themselves into
-user defined types use L<augment|/language/variables#The_augment_Declarator>.
+user defined types use L<augment|/language/variables#The_augment_Declarator> or
+the L<MOP|/language/mop>.
 
     class C {
         has $.int;