pzuraq/ember-legacy-class-shim

This addon provides a shim that reopens `EmberObject` and redefines `.extend`, enabling older versions of Ember (< 2.13.0) to use ES Classes with some limitations. It addresses the "double extend" issue, where the constructor of a class defined using `class` is never called, preventing class fields from being assigned. This addon is for developers using legacy Ember versions who want to adopt ES Classes and decorators while working around the limitations of the older Ember architecture.