constraint now part of the parameter symbol and not of the type

todo.txt

@@ -1,8 +1,8 @@
 version 0.9.2
 =============
 
-- overloading based on ASTs: 'constraint' should not be in PType but for the
-  parameter *symbol*
+- overloading based on ASTs
+- implement generic converters
 
   - implement ``partial`` pragma for partial evaluation: easily done with AST
     overloading
@@ -20,7 +20,7 @@ version 0.9.X
 =============
 
 - implement the missing features wrt inheritance
-- implement generic methods and generic converters
+- implement generic methods
 - improve the compiler as a service
 - ``=`` should be overloadable; requires specialization for ``=``
 - implement constructors + full 'not nil' checking