0.3.X Checklist

[ctrlaltf24]

0.3.X:

• [ ] finalize socketio iter interface? or postpone until 0.4.0?
• [ ] All public types implement Debug, Sync, Send
  • [ ] Data types implement Eq and Clone

[ctrlaltf24]

0.3.0:

• [x] Resolve relevant TODOs
• [x] Be within +/- 20% performance of present main (see https://github.com/1c3t3a/rust-socketio/pull/71 )
• [x] Documentation
  • [x] remove warnings about &Socket callbacks (feature reverted)
• [x] Increase test coverage to around pre-refactor levels
• [x] Change-log (to public interfaces)
  • [x] Add deprecation to 0.2.0 informing users how to update. https://github.com/1c3t3a/rust-socketio/pull/85
• [x] Separate engineio into separate crate
  • [x] Merge https://github.com/1c3t3a/rust-socketio/pull/89
• [x] Allow socketio to specify transport https://github.com/1c3t3a/rust-socketio/issues/94
• [x] https://github.com/1c3t3a/rust-socketio/issues/90
• [X] Address concerns in comments
  • [X] https://github.com/1c3t3a/rust-socketio/pull/101#discussion_r698482795
  • [X] https://github.com/1c3t3a/rust-socketio/pull/101#discussion_r698477692
• [X] Make sure intermittent failure on https://github.com/1c3t3a/rust-socketio/pull/97 does not continue.