Implemented size_t.

Added note about extern types.

TODO.md

@@ -4,11 +4,11 @@ A list of missing things, and stuff that would be nice to have...
 ## Missing Functionality
 
 * MaxGUI - Windows
+* Fix c-style extern struct types.
 
 ## New Features and Improvements
 
 * Method overloading
 * Generics
 * Operator overloading
-* New primitive types (unsigned types, size_t equivalent)
-
+* New primitive types (unsigned types)