If ComponentProvider.getSingleton(com.foo.SomeSubInterface.class) is called, and no component is registered specifically for com.foo.SomeSubInterface, the ComponentProvider should look up registration for parents of com.foo.SomeSubInterface (i.e com.foo.SomeInterface, if SomeSubInterface extends SomeInterface)

This should:

• remove the need for casting when depending on a specific implementation:

  // instead of:
  SomeSubInterface z = (SomeSubInterface) Components.getSingleton(SomeInterface.class);
  // you should be able to do:
  SomeSubInterface z = Components.getSingleton(SomeSubInterface.class);
  // even if only SomeInterface was configured (i.e if there's only a property for com.foo.SomeInterface)
  

• likewise, this should fix MAGNOLIA-3059 – TODO: insert details as to how/why