code: def get (self, feature):
          
          if type(feature) == type([]):
              feature = feature[0]
          if not isinstance(feature, b2.build.feature.Feature):
              feature = b2.build.feature.get(feature)
          assert isinstance(feature, b2.build.feature.Feature)
  
          if self.feature_map_ is None:
              self.feature_map_ = {}
  
              for v in self.all_:
                  if v.feature not in self.feature_map_:
                      self.feature_map_[v.feature] = []
                  self.feature_map_[v.feature].append(v.value)
  
          return self.feature_map_.get(feature, [])
docs: Returns all values of 'feature'.