What's the difference between BlobBuilder and the new Blob constructor?

Question

The W3 announced that they intend to deprecate the BlobBuilder API in preference for the new Blob API.

If I am already using BlobBuilder in a JavaScript app, how can

Answer 1

Passing an ArrayBuffer to the Blob constructor appears to be deprecated, so:

var dataView = new DataView(arrayBuffer);
var blob = new Blob([dataView], { type: mimeString });