docs: function () {
          $assertEveryCalledOnce (function (prototypeMethod, instanceMethod) {
              var instance = null
              var Compo = new $component ({
                  prototypeMethod: function () { $assert (this === instance); prototypeMethod () } })
              instance = new Compo ({
                  instanceMethod:  function () { $assert (this === instance); instanceMethod () } })
  
              instance.prototypeMethod.call (null)
              instance.instanceMethod.call (null) }) }