• Code name "Top Hat", this is a major release.
  
• Added simple JSON serialization and deserialization support to Mojo::Transaction::WebSocket.
  
• Added json event to Mojo::Transaction::WebSocket.
  
• Added render_maybe method to Mojolicious::Controller.
  
• Added again methods to Mojo::Reactor, Mojo::Reactor::Poll and Mojo::Reactor::EV.
  
• Added is_empty method to Mojo::Transaction::HTTP.
  
• Added close_gracefully method to Mojo::IOLoop::Stream.
  
• Changed Mojolicious default secret to the application moniker to make it slightly more secure.
  
• Changed types in Mojolicious::Types to consistently use arrays.
  
• Changed heuristics for number detection in Mojo::JSON to better line up with user expectations.
  
• Changed render and render_static methods in Mojolicious::Controller to call render_not_found if no response could be
  generated.
  
• Removed callback support from body method in Mojo::Message.
  
• Removed Mojolicious::Plugin::PoweredBy and Mojolicious::Plugin::RequestTimer.
  
• Removed pair_separator attribute from Mojolicious::Parameters.
  
• Removed data attribute from Mojo::URL.
  
• Removed captures attribute from Mojolicious::Routes::Match.
  
• Removed charset attribute from Mojo::DOM::HTML.
  
• Removed charset method from Mojo::DOM.
  
• Removed render_data, render_json, render_partial and render_text methods from Mojolicious::Controller.
  
• Removed json_content_is method from Test::Mojo.
  
• Removed has_leftovers method from Mojo::Content.
  
• Removed is_chunked, is_dynamic, is_multipart, has_leftovers, leftovers, write and write_chunk methods from
  Mojo::Message.
  
• Removed hmac_md5_sum method from Mojo::ByteStream.
  
• Removed hmac_md5_sum function from Mojo::Util.
  
• Removed memorize helper.
  
• Removed deprecated end method from Mojo::IOLoop::Delay.
  
• Removed deprecated build_form_tx, build_json_tx, post_form and post_json methods from Mojo::UserAgent.
  
• Removed deprecated form and json methods from Mojo::UserAgent::Transactor.
  
• Removed deprecated post_form_ok and post_json_ok methods from Test::Mojo.
  
• Removed deprecated f and n functions from ojo.
  
• Removed deprecated after_static_dispatch hook.
  
• Renamed shape_match method in Mojolicious::Routes::Pattern to match_partial.
  
• Reduced idle CPU usage of Mojo::IOLoop.
  
• Increased default lock_timeout from 0.5 to 1 second in Mojo::Server::Prefork and Mojo::Server::Hypnotoad.
  
• Improved Mojo::IOLoop performance significantly and reduced CPU usage when managing more than 10k concurrent
  connections.
  
• Improved Mojolicious to be able to detect the current operating mode from the PLACK_ENV environment variable.
  
• Improved Mojolicious to not trap exceptions if the default exception handling has been deactivated.
  
• Improved json_is and json_message_is methods in Test::Mojo by making the JSON Pointer optional. (jberger)
  
• Improved renderer performance.
  
• Improved Mojo::DOM::HTML performance.
  
• Improved Mojo::Reactor::Poll performance.
  
• Improved html_unescape performance in Mojo::Util.
  
• Improved Mojolicious::Plugin::EPLRenderer to cache templates more efficiently.
  
• Fixed Perl 5.17.11+ compatibility.
  
• Fixed Mojo::JSON to encode "inf" and "nan" values as strings. (chansen)
  
• Fixed a few authority and rendering bugs in Mojo::URL.
  
• Fixed layout bugs in Mojolicious::Renderer.
  
• Fixed support for HEAD request method in Mojo::Server::CGI and Mojo::Server::PSGI.
  
• Fixed small line directive bug in Mojo::Template.
  
• Fixed small limit bug in Mojo::Message.