The reflect2 package provides a reflection API that avoids runtime
 reflect.Value cost:
 .
  * reflect get/set interface{}, with type checking
  * reflect get/set unsafe.Pointer, without type checking
  * reflect2.TypeByName works like Class.forName found in Java
 .
 This package is designed for low level libraries to optimize reflection
 performance. General applications should still use the standard library
 reflect.