FR: Example of consuming metadata from the /odata/$metadata URI

[PhilBlackRose]

I encountered this very useful set of snippets, but unfortunately I have not found what I'm looking for.

Updating from odata V3 to V4 endpoint, and needing to replace:

OData.read(
   "/odata/$metadata", 
   function (metadata) {
      OData.defaultMetadata.push(metadata);
   },
   function (error) {
      showError(error);
   },
   OData.metadataHandler
);

It would be wonderful if this could be added.