• Added EXPERIMENTAL max_memory_size attribute to Mojo::Asset::Memory.
  
• Added EXPERIMENTAL is_file methods to Mojo::Asset and Mojo::Asset::File.
  
• Improved start_tls method in Mojo::IOLoop by allowing it to accept more options.
  
• Improved MOJO_MAX_MEMORY_SIZE handling by moving it from Mojo::Content::Single to Mojo::Asset::Memory.
  
• Fixed HTTPS proxy bug in Mojo::UserAgent.