code: public static Set<Field> getFieldsOfType(Object object, Class<?> type) {
  		return WhiteboxImpl.getFieldsOfType(object, type);
  	}
docs: Get all fields assignable from a particular type. This method traverses
  the class hierarchy when checking for the type.
  
  @param object
  The object to look for type. Note that if're you're passing an
  object only instance fields are checked, passing a class will
  only check static fields.
  @param type
  The type to look for.
  @return A set of all fields of the particular type.