Enhancements

• Handle system messages and parent exits while closing the connection.
• The output from :sys.get_status didn't look pretty in :observer; now it does!
• format_status/2 now an optional callback.

Bug Fixes

• SSL frames sent right after connecting will now be handled instead of being left in a dead Task mailbox.
• Fixed some places where dialyzer told me I had my specs screwed up.