IssuesService.get fails, type cast error

[HansMuller]

The following app fails with 4.0.0 of the github package and the 2.1.0-dev.9.4 version of Dart used by the flutter project:

import 'dart:async';
import 'package:github/server.dart';

void main() {
  GitHub github = createGitHubClient(auth: new Authentication.withToken(myToken));
  RepositorySlug slug = RepositorySlug("flutter", "flutter");
  github.repositories.getRepository(slug).then((Repository repository) {
    github.issues.get(slug, 22781).then((Issue issue) {
      print(issue.htmlUrl);
    });
  });
}

Here's the swan song:

Unhandled exception:
type 'List<dynamic>' is not a subtype of type 'List<Map<String, dynamic>>' in type cast
#0      Issue.fromJSON (... pub.dartlang.org/github-4.0.0/lib/src/common/model/issues.dart:64:34)
#1      GitHub.getJSON (... pub.dartlang.org/github-4.0.0/lib/src/common/github.dart:226:32)
<asynchronous suspension>
#2      IssuesService.get (file:///usr/local/google/home/hansmuller/.pub-cache/hosted/pub.dartlang.org/github-4.0.0/lib/src/common/issues_service.dart:141:15)
#3      main.<anonymous closure> (package:issues/main.dart:9:19)

I tried the app with Dart VM version: 2.0.0-dev.36.0 since the package claims to support that version.

NoSuchMethodError: Attempted to use type 'IOClient' as a function. Since types do not define a method 'call', this is not possible. Did you intend to call the IOClient constructor and forget the 'new' operator?
Receiver: IOClient
Tried calling: IOClient()
#0      Object.noSuchMethod (dart:core-patch/dart:core/object_patch.dart:46)
#1      createClient (package:http/src/io_client.dart:16:38)
#2      new Client (package:http/src/client.dart:35:23)
#3      new GitHub (package:github/src/common/github.dart:48:44)
#4      createGitHubClient (package:github/server.dart:20:14)
#5      main (file:///usr/local/google/home/hansmuller/issues/lib/main.dart:6:19)

[pq]

Oh yeah, looks like a bunch of dynamic casts need updating.

(Still an issue on head (2.2.0-edge.0a0ee50501843425e1ba1cb090d9e0a2f42e9371 (Fri Dec 21 23:47:23 2018 +0000)).)

[pq]

I took a quick crack at a fix (#126).

@HansMuller, if you update your dev_dependencies like this,

  github:
    git:
      url: git://github.com/pq/github.dart.git
      ref: issue_cast_fixes

you might get unblocked in the short-term.