code: async function _convertBlobs (rawArchive) {
    let resources = rawArchive.resources
    let paths = Object.keys(resources)
    for (var i = 0; i < paths.length; i++) {
      let record = resources[paths[i]]
      if (record.encoding === 'blob') {
        record.data = await _blobToArrayBuffer(record.data)
      }
    }
  }
docs: /*
  Convert all blobs to array buffers