Add link to scripted function definition.

CHANGELOG.md

@@ -32,6 +32,12 @@ Speed improvements
 Net features
 ------------
 
+### First class functions (sort of)
+
+* A function pointer created via a closure definition now links to the particular anonymous function itself.
+* This avoids a potentially expensive function lookup when the function pointer is called, speeding up closures.
+* It does _not_, however, allow the function pointer to be `export`ed as a constant from a script module because the closure may cross-call other functions defined in the module and the function pointer won't keep the fully encapsulated environment.
+
 ### `!in`
 
 * A new operator `!in` is added which maps to `!(... in ...)`.