code: function optimizeComponents(copy, source) {
    var removeAttribute = HTMLElement.prototype.removeAttribute;
    var setAttribute = HTMLElement.prototype.setAttribute;
    var components = source.components || {};
    Object.keys(components).forEach(function(name) {
      var component = components[name];
      var result = getImplicitValue(component, source);
      var isInherited = result[1];
      var implicitValue = result[0];
      var currentValue = source.getAttribute(name);
      var optimalUpdate = getOptimalUpdate(
        component,
        implicitValue,
        currentValue
      );
      var doesNotNeedUpdate = optimalUpdate === null;
      if (isInherited && doesNotNeedUpdate) {
        removeAttribute.call(copy, name);
      } else {
        var schema = component.schema;
        var value = stringifyComponentValue(schema, optimalUpdate);
        setAttribute.call(copy, name, value);
      }
    });
  }
docs: Removes from copy those components or components' properties that comes from
  primitive attributes, mixins, injected default components or schema defaults.
  
  @param {Element} copy   Destinatary element for the optimization.
  @param {Element} source Element to be optimized.