How to retrieve blob with binary content? #83

Hello! I tried to retrieve a binary blob (a 13k PNG file) using the #wip branch (on OSX):

Git.Repo.open(REPO_PATH, function(error, repo) {
  repo.getBlob(oid, function(error, blob) {
    var content = blob.content();
    if (blob.isBinary()) {
      fs.writeFileSync('BROKEN.png', content);
    }
  });
});

The first 4 or 5 bytes seem to match (they are ffd8 ffe0 00) but the rest of the bytes seem to be random memory; they change on subsequent retrievals of the same blob.

However, text files seem to work. Am I doing something dumb?